WO2014014319A1 - Method and apparatus for determining transmission power of uplink control channel in wireless communication system - Google Patents

Method and apparatus for determining transmission power of uplink control channel in wireless communication system Download PDF

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WO2014014319A1
WO2014014319A1 PCT/KR2013/006507 KR2013006507W WO2014014319A1 WO 2014014319 A1 WO2014014319 A1 WO 2014014319A1 KR 2013006507 W KR2013006507 W KR 2013006507W WO 2014014319 A1 WO2014014319 A1 WO 2014014319A1
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cell
subframe
ul
dl
ack
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PCT/KR2013/006507
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French (fr)
Korean (ko)
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서동연
양석철
안준기
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엘지전자 주식회사
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Priority to US61/706,760 priority
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Priority to US201261711181P priority
Priority to US61/711,181 priority
Priority to US201261718709P priority
Priority to US61/718,709 priority
Application filed by 엘지전자 주식회사 filed Critical 엘지전자 주식회사
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04TPC
    • H04W52/06TPC algorithms
    • H04W52/14Separate analysis of uplink or downlink
    • H04W52/146Uplink power control
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04TPC
    • H04W52/30TPC using constraints in the total amount of available transmission power
    • H04W52/32TPC of broadcast or control channels
    • H04W52/325Power control of control or pilot channels
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management, e.g. wireless traffic scheduling or selection or allocation of wireless resources
    • H04W72/04Wireless resource allocation
    • H04W72/0406Wireless resource allocation involving control information exchange between nodes
    • H04W72/0413Wireless resource allocation involving control information exchange between nodes in uplink direction of a wireless link, i.e. towards network
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04TPC
    • H04W52/38TPC being performed in particular situations
    • H04W52/48TPC being performed in particular situations during retransmission after error or non-acknowledgment

Abstract

Disclosed are a method for determining the transmission power of an uplink control channel of a terminal which has been assigned, by a base station, two cells that have different UL-DL configurations, and an apparatus using the method. The method comprises: choosing a larger value between N1, the number of downlink subframes that correspond to subframe n of a first cell having a first UL-DL configuration, and N2, the number of downlink subframes that correspond to subframe n of a second cell having a second UL-DL configuration; and determining a parameter value based on the chosen value, wherein the parameter determines the transmission power of an uplink control channel which is transmitted in subframe n.

Description

Method and apparatus for determining transmit power of uplink control channel in wireless communication system

The present invention relates to wireless communication, and more particularly, to a method of determining a transmission power of an uplink control channel in a wireless communication system and an apparatus using the method.

In 3rd Generation Partnership Project (3GPP) long term evolution-advanced (LTE-A), carrier aggregation, in which a plurality of carriers are aggregated and allocated to a terminal, is supported.

The carrier used for carrier aggregation may be a carrier file using a time division duplex (TDD) frame (TDD frame) structure. The TDD frame may have various uplink-downlink configuration (UL-DL configuration). Conventional carrier aggregation in TDD presupposes that the UL-DL configuration of each carrier is the same, but recently, it is also considered to aggregate carriers having different UL-DL configurations.

Meanwhile, in a wireless communication system, a hybrid automatic repeat request (HARQ) may be used. HARQ receives an acknowledgment / not-acknowledgement (ACK / NACK) that is acknowledgment information about the data after the transmitter transmits data, and transmits new data or retransmits previously transmitted data according to the ACK / NACK. Technique.

ACK / NACK may be transmitted through an uplink control channel. In this case, the transmission power of the uplink control channel may be determined based on a parameter dependent on the physical uplink control channel (PUCCH) format. In TDD, the parameter may be defined differently according to the number of downlink subframes (denoted as M) corresponding to an uplink subframe in which ACK / NACK is transmitted.

However, when carriers having different UL-DL configurations are aggregated in TDD, the M value may be different in the same uplink subframe of each carrier. Therefore, there is a need for a method of determining a transmit power of an uplink control channel considering this.

A method and apparatus for determining transmit power of an uplink control channel in a wireless communication system are provided.

In one aspect, the present invention provides a method for determining a transmission power of an uplink control channel of a terminal having two cells having different UL-DL configurations configured from a base station. The method includes the number N1 of downlink subframes corresponding to the subframe n of the first cell having the first UL-DL configuration and the downlink corresponding to the subframe n of the second cell having the second UL-DL configuration. A large value is selected from the number N2 of subframes, and a parameter value is determined based on the selected value, wherein the parameter is a parameter for determining a transmission power of an uplink control channel transmitted in the subframe n. It is done.

In another aspect, an apparatus for determining transmit power of an uplink control channel provided includes an RF unit configured to transmit and receive a radio signal; And a processor connected to the RF unit, wherein the processor has a second number of downlink subframes N1 and a second UL-DL configuration corresponding to subframe n of a first cell having a first UL-DL configuration; Select a larger value of the number N2 of downlink subframes corresponding to the subframe n of the cell, and determine a parameter value based on the selected value, wherein the parameter is an uplink control transmitted in the subframe n Characterized in that the parameter determines the transmission power of the channel.

When a UE, which has received a plurality of cells having different UL-DL configurations, transmits ACK / NACK for a different number of DL subframes for each cell through PUCCH, transmit power may be effectively allocated.

1 shows a structure of a frequency division duplex (FDD) radio frame in 3GPP LTE.

2 shows a structure of a time division duplex (TDD) radio frame in 3GPP LTE.

3 shows an example of a resource grid for one downlink slot.

4 shows a downlink subframe.

5 shows a structure of an uplink subframe.

6 shows a channel structure of PUCCH format 2 / 2a / 2b for one slot in a normal CP.

7 shows PUCCH formats 1a / 1b for one slot in a normal CP.

8 illustrates a channel structure of PUCCH format 3.

9 illustrates a synchronization HARQ.

10 is a comparative example of a conventional single carrier system and a carrier aggregation system.

11 shows an example of E-PDCCH allocation.

12 shows examples of ACK / NACK timing in aggregation of cells using different UL-DL configurations.

13 and 14 show examples of cell-specific UL-DL configuration and reference UL-DL configuration in primary and secondary cells.

15 shows an example of distinguishing an invalid DL subframe and a valid DL subframe.

16 illustrates a PUCCH transmission power determination method according to an embodiment of the present invention.

17 shows a configuration of a base station and a terminal according to an embodiment of the present invention.

The user equipment (UE) may be fixed or mobile, and may include a mobile station (MS), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), a wireless device, and a personal digital assistant (PDA). It may be called other terms such as digital assistant, wireless modem, handheld device.

A base station generally refers to a fixed station communicating with a terminal, and may be referred to as other terms such as an evolved-NodeB (eNB), a base transceiver system (BTS), and an access point.

1 shows a structure of a frequency division duplex (FDD) radio frame in 3GPP LTE. This may be referred to section 4 of 3GPP TS 36.211 V8.7.0 (2009-05) "Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Channels and Modulation (Release 8)".

The radio frame includes 10 subframes indexed from 0 to 9. One subframe (subframe) includes two consecutive slots. The time taken for one subframe to be transmitted is called a transmission time interval (TTI). For example, the length of one subframe may be 1 ms (milli-second) and the length of one slot may be 0.5 ms.

2 shows a structure of a time division duplex (TDD) radio frame in 3GPP LTE. Time period of the one radio frame is in the relationship of 307200 ∙ T s = 10 milli- second (ms).

A downlink (DL) subframe, an uplink (UL) subframe, and a special subframe (special subframe, S subframe) may coexist in the TDD radio frame.

Table 1 shows an example of an uplink-downlink configuration (UL-DL configuration) of a radio frame.

TABLE 1

Figure PCTKR2013006507-appb-I000001

In the table, 'D' represents a DL subframe, 'U' represents a UL subframe, and 'S' represents a special subframe. Upon receiving the UL-DL configuration from the base station, the terminal may know which subframe is the DL subframe or the UL subframe in the radio frame according to the UL-DL configuration. The UL-DL configuration may be transmitted by being included in a higher layer signal and system information.

Meanwhile, when ten subframes within a radio frame are indexed from 0 to 9, the subframes having subframe indexes # 1 and # 6 may be special subframes. The special subframe includes a downlink pilot time slot (DwPTS), a guard period (GP) and an uplink pilot time slot (UpPTS). DwPTS is used for initial cell search, synchronization or channel estimation at the terminal. UpPTS is used for channel estimation at the base station and synchronization of uplink transmission of the terminal. GP is a section for removing interference caused in the uplink due to the multipath delay of the downlink signal between the uplink and the downlink.

3 shows an example of a resource grid for one downlink slot.

Referring to FIG. 3, the downlink slot includes a plurality of OFDM symbols in the time domain and includes N RB resource blocks (RBs) in the frequency domain. The RB includes one slot in the time domain and a plurality of consecutive subcarriers in the frequency domain in resource allocation units. The number N RB of resource blocks included in the downlink slot depends on a downlink transmission bandwidth set in a cell. For example, in the LTE system, N RB may be any one of 6 to 110. The structure of the uplink slot may also be the same as that of the downlink slot.

Meanwhile, each element on the resource grid is called a resource element (RE). Resource elements on the resource grid may be identified by an index pair (k, l) in the slot. Here, k (k = 0, ..., N RB × 12-1) is a subcarrier index and l (l = 0, ..., 6) is an intra slot OFDM symbol index.

In FIG. 3, one resource block includes 7 OFDM symbols in the time domain and 12 subcarriers in the frequency domain to include 7 × 12 resource elements, but the number of OFDM symbols and the number of subcarriers in the resource block is exemplarily described. It is not limited to this. One slot in a normal CP may include 7 OFDM symbols, and one slot in an extended CP may include 6 OFDM symbols. The number of OFDM symbols and the number of subcarriers may be the length of the CP and the frequency spacing. It may be changed in various ways according to. The number of subcarriers in one OFDM symbol may be selected and used among 128, 256, 512, 1024, 1536 and 2048.

4 shows a downlink subframe.

A downlink (DL) subframe is divided into a control region and a data region in the time domain. The control region includes up to four OFDM symbols preceding the first slot in the subframe, but the number of OFDM symbols included in the control region may be changed. A physical downlink control channel (PDCCH) and another control channel are allocated to the control region, and a PDSCH is allocated to the data region.

As disclosed in 3GPP TS 36.211 V10.2.0, physical control channels in 3GPP LTE / LTE-A include a physical downlink control channel (PDCCH), a physical control format indicator channel (PCFICH), and a physical hybrid-ARQ indicator channel (PHICH). .

The PCFICH transmitted in the first OFDM symbol of a subframe carries a control format indicator (CFI) regarding the number of OFDM symbols (that is, the size of the control region) used for transmission of control channels in the subframe. The wireless device first receives the CFI on the PCFICH and then monitors the PDCCH. Unlike the PDCCH, the PCFICH does not use blind decoding and is transmitted on a fixed PCFICH resource of a subframe.

The PHICH carries an acknowledgment (ACK) / not-acknowledgement (NACK) signal for an uplink (UL) hybrid automatic repeat request (HARQ) process. The ACK / NACK signal for uplink (UL) data on the PUSCH transmitted by the terminal is transmitted by the base station on the PHICH.

The Physical Broadcast Channel (PBCH) is transmitted in the preceding four OFDM symbols of the second slot of the first subframe of the radio frame. The PBCH carries system information necessary for the wireless device to communicate with the base station, and the system information transmitted through the PBCH is called a master information block (MIB). In comparison, system information transmitted on the PDSCH indicated by the PDCCH is called a system information block (SIB).

Control information transmitted through the PDCCH is called downlink control information (DCI). DCI can be assigned to the resource allocation of the PDSCH (also referred to as downlink grant or DL assignment), the resource allocation of the PUSCH (also referred to as UL grant), to individual UEs in any UE group. A set of transmit power control commands for each and / or activation of Voice over Internet Protocol (VoIP).

In 3GPP LTE / LTE-A, transmission of a DL transport block is performed by a pair of PDCCH and PDSCH. Transmission of the UL transport block is performed by a pair of PDCCH and PUSCH. For example, the wireless device receives a DL transport block on a PDSCH indicated by the PDCCH. The wireless device monitors the PDCCH in the DL subframe and receives the DL resource allocation on the PDCCH. The wireless device receives the DL transport block on the PDSCH indicated by the DL resource allocation.

The base station determines the PDCCH format according to the DCI to be sent to the wireless device, attaches a cyclic redundancy check (CRC) to the DCI, and identifies a unique identifier according to the owner or purpose of the PDCCH (this is called a Radio Network Temporary Identifier (RNTI)). ) To the CRC.

If it is a PDCCH for a specific wireless device, a unique identifier of the wireless device, for example, a C-RNTI (Cell-RNTI) may be masked to the CRC. Alternatively, if the PDCCH is for a paging message, a paging indication identifier, for example, P-RNTI (P-RNTI), may be masked to the CRC. If it is a PDCCH for system information, a system information identifier and a system information-RNTI (SI-RNTI) may be masked to the CRC. A random access-RNTI (RA-RNTI) may be masked in the CRC to indicate a random access response that is a response to the transmission of the random access preamble. The TPC-RNTI may be masked to the CRC to indicate a transmit power control (TPC) command for the plurality of wireless devices. In the PDCCH for semi-persistent scheduling (SPS), the SPS-C-RNTI may be masked to the CRC. The SPS will be described later.

When a C-RNTI series (for example, C-RNTI, SPS-C-RNTI, or Temporary C-RNTI) is used, the PDCCH is control information for a specific wireless device (this is called UE-specific control information). If another RNTI is used, the PDCCH carries common control information received by all or a plurality of wireless devices in the cell.

The DCI to which the CRC is added is encoded to generate coded data. Encoding includes channel encoding and rate matching. The coded data is modulated to generate modulation symbols. Modulation symbols are mapped to physical resource elements (REs).

The control region in the subframe includes a plurality of control channel elements (CCEs). The CCE is a logical allocation unit used to provide a coding rate according to the state of a radio channel to a PDCCH and corresponds to a plurality of resource element groups (REGs). The REG includes a plurality of resource elements (REs). The format of the PDCCH and the number of bits of the PDCCH are determined according to the correlation between the number of CCEs and the coding rate provided by the CCEs.

One REG includes four REs and one CCE includes nine REGs. {1, 2, 4, 8} CCEs may be used to configure one PDCCH, and each element of {1, 2, 4, 8} is called a CCE aggregation level.

The number of CCEs used for transmission of the PDDCH is determined by the base station according to the channel state. For example, for a wireless device having a good downlink channel state, one CCE may be used for PDCCH transmission. Eight CCEs may be used for PDCCH transmission for a wireless device having a poor downlink channel state.

A control channel composed of one or more CCEs performs interleaving in units of REGs and is mapped to physical resources after a cyclic shift based on a cell ID.

5 shows a structure of an uplink subframe.

Referring to FIG. 5, an uplink subframe may be divided into a control region and a data region in the frequency domain. A physical uplink control channel (PUCCH) for transmitting uplink control information is allocated to the control region. The data area is allocated a PUSCH (Physical Uplink Shared Channel) for transmitting data (in some cases, control information may also be transmitted). According to the configuration, the UE may simultaneously transmit the PUCCH and the PUSCH, or may transmit only one of the PUCCH and the PUSCH.

PUCCH for one UE is allocated to an RB pair in a subframe. Resource blocks belonging to a resource block pair occupy different subcarriers in each of a first slot and a second slot. The frequency occupied by RBs belonging to the RB pair allocated to the PUCCH is changed based on a slot boundary. This is called that the RB pair allocated to the PUCCH is frequency-hopped at the slot boundary. By transmitting uplink control information through different subcarriers over time, a frequency diversity gain can be obtained.

On the PUCCH, HARQ ACK / NACK (hereinafter, simply referred to as ACK / NACK or HARQ-ACK), channel status information (CSI) indicating downlink channel status, for example, channel quality indicator (CQI), PMI ( A precoding matrix index (PTI), a precoding type indicator (PTI), and a rank indication (RI) may be transmitted.

The CQI provides information on link adaptive parameters that the terminal can support for a given time. The CQI may indicate a data rate that can be supported by the downlink channel in consideration of characteristics of the terminal receiver and signal to interference plus noise ratio (SINR). The base station may determine the modulation (QPSK, 16-QAM, 64-QAM, etc.) and coding rate to be applied to the downlink channel using the CQI. CQI can be generated in several ways. For example, a method of quantizing and feeding back a channel state as it is, a method of calculating a feedback to a signal to interference plus noise ratio (SINR), and a method of notifying a state that is actually applied to a channel such as a modulation coding scheme (MCS) may be used. have. When the CQI is generated based on the MCS, the MCS includes a modulation scheme, a coding scheme, a coding rate, and the like.

PMI provides information about the precoding matrix in the codebook based precoding. PMI is associated with multiple input multiple output (MIMO). Feedback of PMI in MIMO is called closed loop MIMO (closed loop MIMO).

The RI is information about a rank (ie, number of layers) recommended by the UE. That is, RI represents the number of independent streams used for spatial multiplexing. The RI is fed back only when the terminal operates in the MIMO mode using spatial multiplexing. RI is always associated with one or more CQI feedback. In other words, the fed back CQI is calculated assuming a specific RI value. Since the rank of the channel generally changes slower than the CQI, the RI is fed back fewer times than the CQI. The transmission period of the RI may be a multiple of the CQI / PMI transmission period. RI is given for the entire system band and frequency selective RI feedback is not supported.

PUCCH carries various kinds of control information according to a format. PUCCH format 1 carries a scheduling request (SR). In this case, an OOK (On-Off Keying) method may be applied. PUCCH format 1a carries ACK / NACK modulated by a binary phase shift keying (BPSK) scheme for one codeword. PUCCH format 1b carries ACK / NACK modulated by Quadrature Phase Shift Keying (QPSK) for two codewords. PUCCH format 2 carries a channel quality indicator (CQI) modulated in a QPSK scheme. PUCCH formats 2a and 2b carry CQI and ACK / NACK.

The PUCCH format may be classified according to a modulation scheme and the number of bits that can be transmitted per subframe. Table 2 shows the modulation scheme according to the PUCCH format and the number of bits in the subframe.

TABLE 2

Figure PCTKR2013006507-appb-I000002

All PUCCH formats use a cyclic shift (CS) of a sequence in each OFDM symbol. The cyclically shifted sequence is generated by cyclically shifting a base sequence by a specific cyclic shift amount. The specific CS amount is indicated by the cyclic shift index (CS index).

An example of defining the basic sequence r u (n) is as follows.

[Equation 1]

Figure PCTKR2013006507-appb-I000003

Where u is the root index, n is the element index, and 0≤n≤N-1, and N is the length of the base sequence. b (n) is defined in section 5.5 of 3GPP TS 36.211 V8.7.0.

The length of the sequence is equal to the number of elements included in the sequence. u may be determined by a cell identifier (ID), a slot number in a radio frame, or the like. When the base sequence is mapped to one resource block in the frequency domain, the length N of the base sequence is 12 since one resource block includes 12 subcarriers. Different base sequences define different base sequences.

The cyclically shifted sequence r (n, I cs ) may be generated by cyclically shifting the base sequence r (n) as shown in Equation 2 below.

[Equation 2]

Figure PCTKR2013006507-appb-I000004

Here, I cs is a cyclic shift index indicating the CS amount (0 ≦ I cs ≦ N-1).

The available cyclic shift index of the base sequence refers to a cyclic shift index derived from the base sequence according to the CS interval. For example, if the length of the base sequence is 12 and the CS interval is 1, the total number of available cyclic shift indices of the base sequence is 12. Alternatively, if the length of the base sequence is 12 and the CS interval is 2, the total number of available cyclic shift indices of the base sequence is six.

6 shows a channel structure of PUCCH format 2 / 2a / 2b for one slot in a normal CP. As described above, the PUCCH format 2 / 2a / 2b is used for transmission of CQI.

Referring to FIG. 6, SC-FDMA symbols 1 and 5 in a normal CP are used for a DM RS (demodulation reference symbol) which is an uplink reference signal. In the case of an extended CP, a single carrier-freuquency division multple access (SC-FDMA) symbol 3 is used for the DM RS.

Ten CQI information bits are channel coded, for example, at a rate of 1/2, resulting in 20 coded bits. Reed-Muller (RM) codes may be used for channel coding. And scrambling (similar to PUSCH data being scrambled into a gold sequence of length 31) followed by QPSK constellation mapping to generate QPSK modulation symbols (d 0 to d 4 in slot 0). Each QPSK modulation symbol is modulated with a cyclic shift of a basic RS sequence of length 12 and OFDM modulated, and then transmitted in each of 10 SC-FDMA symbols in a subframe. 12 uniformly spaced cyclic shifts allow 12 different terminals to be orthogonally multiplexed in the same PUCCH resource block. As a DM RS sequence applied to SC-FDMA symbols 1 and 5, a basic RS sequence of length 12 may be used.

7 shows PUCCH formats 1a / 1b for one slot in a normal CP. The uplink reference signal is transmitted in the third to fifth SC-FDMA symbols. In FIG. 7, w 0 , w 1 , w 2 and w 3 may be modulated in the time domain after Inverse Fast Fourier Transform (IFFT) modulation or in the frequency domain before IFFT modulation.

One slot includes seven OFDM symbols, three OFDM symbols become RS (Reference Signal) OFDM symbols for reference signals, and four OFDM symbols become data OFDM symbols for ACK / NACK signals.

In PUCCH format 1b, modulation symbol d (0) is generated by modulating an encoded 2-bit ACK / NACK signal with Quadrature Phase Shift Keying (QPSK).

The cyclic shift index I cs may vary depending on the slot number n s in the radio frame and / or the symbol index l in the slot.

Since the four data OFDM symbols for transmission of the ACK / NACK signal in a slot in the normal CP, the Let cyclic shift index corresponding to each data OFDM symbol cs0 I, I cs1, cs2 I, I cs3.

The modulation symbol d (0) is spread to the cyclically shifted sequence r (n, I cs ). When the one-dimensional spread sequence corresponding to the (i + 1) -th OFDM symbol in the slot is m (i),

{m (0), m (1), m (2), m (3)} = {d (0) r (n, I cs0 ), d (0) r (n, I cs1 ), d (0 ) r (n, I cs2 ), d (0) r (n, I cs3 )}.

In order to increase the terminal capacity, the one-dimensional spread sequence may be spread using an orthogonal sequence. An orthogonal sequence w i (k) (i is a sequence index, 0 ≦ k ≦ K−1) having a spreading factor K = 4 uses the following sequence.

TABLE 3

Figure PCTKR2013006507-appb-I000005

An orthogonal sequence w i (k) (i is a sequence index, 0 ≦ k ≦ K−1) having a spreading coefficient K = 3 uses the following sequence.

TABLE 4

Figure PCTKR2013006507-appb-I000006

Different spreading coefficients may be used for each slot.

Therefore, given any orthogonal sequence index i, the two-dimensional spreading sequence {s (0), s (1), s (2), s (3)} can be expressed as follows.

{s (0), s (1), s (2), s (3)} = {w i (0) m (0), w i (1) m (1), w i (2) m ( 2), w i (3) m (3)}

Two-dimensional spread sequences {s (0), s (1), s (2), s (3)} are transmitted in the corresponding OFDM symbol after IFFT is performed. As a result, the ACK / NACK signal is transmitted on the PUCCH.

The reference signal of the PUCCH format 1b is also transmitted by cyclically shifting the base sequence r (n) and spreading it in an orthogonal sequence. When the cyclic shift indexes corresponding to three RS OFDM symbols are I cs4 , I cs5 and I cs6 , three cyclically shifted sequences r (n, I cs4 ), r (n, I cs5 ), r (n, I cs6 ). These three cyclically shifted sequences are spread to orthogonal sequence w RS, i (k) with K = 3.

The orthogonal sequence index i, the cyclic shift index I cs, and the resource block index m are parameters necessary for configuring a PUCCH and resources used to distinguish a PUCCH (or a terminal). If the number of available cyclic shifts is 12 and the number of available orthogonal sequence indexes is 3, PUCCHs for a total of 36 terminals may be multiplexed into one resource block.

In 3GPP LTE, a resource index n (1) PUCCH is defined so that the UE acquires the three parameters for configuring the PUCCH . Resource index n (1) PUCCH = n CCE + N (1) PUCCH , where n CCE is the corresponding DCI (i.e., downlink resource allocation for receiving downlink data targeted for ACK / NACK signal). The index of the first CCE (CCE having the lowest index) used for transmission, and N (1) PUCCH is a parameter that the base station informs the user equipment as an upper layer message.

Hereinafter, time, frequency, and code resources used for transmission of the ACK / NACK signal are referred to as ACK / NACK resources or PUCCH resources. As described above, an index for determining a PUCCH resource (this is called a PUCCH index), that is, an index required for transmitting an ACK / NACK signal on the PUCCH is defined as {orthogonal sequence index i, cyclic shift index I cs , resource block It may be represented by at least one of the index m} or the index n (1 PUCCH ) for obtaining the three indexes. In other words, the PUCCH resource may include at least one of an orthogonal sequence, a cyclic shift, a resource block, and a combination thereof, and an index representing the PUCCH resource may be referred to as a PUCCH index.

Meanwhile, in LTE-A, PUCCH format 3 is used to transmit uplink control information (eg, ACK / NACK and SR) of up to 21 bits (this is the number of bits before channel coding with information bits, and up to 22 bits when SR is included). This was introduced. PUCCH format 3 uses QPSK as a modulation scheme, and the number of bits that can be transmitted in a subframe is 48 bits (that is, the number of bits transmitted after channel coding information bits).

PUCCH format 3 performs block spreading based transmission. That is, a modulation symbol sequence obtained by modulating a multi-bit ACK / NACK using a block spreading code is spread in a time domain and then transmitted.

8 illustrates a channel structure of PUCCH format 3.

Referring to FIG. 8, the modulation symbol sequence {d1, d2, ...} is spread in the time domain by applying a block spreading code. The block spreading code may be an orthogonal cover code (OCC). Here, in the modulation symbol sequence, multi-bit ACK / NACK information bits are channel coded (using RM code, TBCC, punctured RM code, etc.) to generate ACK / NACK coded bits, and the ACK / NACK coded bits It may be a sequence of modulated (eg, QPSK) modulated symbols. The sequence of modulation symbols is transmitted after being mapped to data symbols of a slot through a fast Fourier transform (FFT) and an inverse fast Fourier transform (IFFT). Although FIG. 8 illustrates the case where three RS symbols exist in one slot, two RS symbols may exist and in this case, a block spreading code of length 5 may be used.


Semi-persistent scheduling (SPS)

In a wireless communication system, a terminal receives scheduling information such as a DL grant, a UL grant, etc. through a PDCCH, and the terminal receives a PDSCH and transmits a PUSCH based on the scheduling information. In general, the DL grant and the PDSCH are received in the same subframe. In the case of FDD, the PUSCH is transmitted after 4 subframes from the subframe in which the UL grant is received. In addition to such dynamic scheduling, LTE also provides semi-persistent scheduling (SPS).

The downlink or uplink SPS may inform the UE in which subframes a semi-static transmission (PUSCH) / reception (PDSCH) is performed through an upper layer signal such as radio resource control (RRC). The parameter given as the higher layer signal may be, for example, a period and an offset value of the subframe.

After recognizing the SPS transmission / reception through the RRC signaling, the terminal performs or releases the SPS transmission / reception when receiving an activation and release signal of the SPS transmission through the PDCCH. That is, even if the terminal receives the SPS through RRC signaling, instead of performing the SPS transmission / reception immediately, but receiving the activation or release signal through the PDCCH, the frequency resource (resource block) according to the resource block allocation specified in the PDCCH, MCS SPS transmission / reception is performed in a subframe corresponding to a subframe period and an offset value allocated through RRC signaling by applying a modulation and a coding rate according to the information. If the SPS release signal is received through the PDCCH, the SPS transmission / reception is stopped. When the suspended SPS transmission / reception receives a PDCCH including an SPS activation signal (SPS reactivation PDCCH), the SPS transmission / reception resumes using a frequency resource designated by the corresponding PDCCH, an MCS, and the like.

The PDCCH for SPS activation is referred to as the SPS activation PDCCH and the PDCCH for SPS release is called the SPS release PDCCH. The UE may authenticate whether the PDCCH is an SPS activation / deactivation PDCCH when all of the following conditions are satisfied. 1. CRC parity bits obtained from the PDCCH payload are scrambled with the SPS C-RNTI, and 2. The value of the new data indicator field should be '0'. In addition, when each field value included in the PDCCH is set as shown in the following table, the UE receives downlink control information (DCI) of the corresponding PDCCH as SPS activation or release.

TABLE 5

Figure PCTKR2013006507-appb-I000007

Table 5 shows field values of the SPS activation PDCCH for authenticating the SPS activation.

 TABLE 6

Figure PCTKR2013006507-appb-I000008

Table 6 shows field values of the SPS release PDCCH for authenticating the SPS release.

According to the SPS, the PDSCH transmitted in the same subframe as the PDCCH indicating the SPS activation has a corresponding PDCCH (that is, the PDCCH indicating the SPS activation), but a subsequent PDSCH, that is, a PDSCH scheduled later by the SPS ( This SPS PDSCH) has no corresponding PDCCH. Accordingly, when transmitting ACK / NACK for the SPS PDSCH, it is impossible to use a PUCCH resource mapped to the lowest CCE index of the PDCCH.

Accordingly, for the SPS, the base station presets a plurality of resources through an upper layer signal such as an RRC message, and then dedicates the TPC field included in the PDCCH indicating SPS activation to the ACK / NACK resource indicator (ARI). The ACK / NACK transmission resource for the SPS PDSCH may be indicated in a manner of indicating a specific resource among resources of. This type of ACK / NACK transmission resource may be referred to as an explicit PUCCH resource.

<Hybrid automatic repeat request (HARQ)>

When transmitting or receiving data between the base station and the terminal, when a frame is not received or is damaged, error control methods include an automatic repeat request (ARQ) method and a more advanced hybrid ARQ (HARQ) method. The ARQ method waits for an acknowledgment message (ACK) after one frame transmission, and on the receiving side, sends an acknowledgment message (ACK) only when it is properly received, and sends an NACK (negative-ACK) message when an error occurs in the frame. An errored receive frame deletes the information from the receive buffer. When the transmitting side receives the ACK signal, the frame is transmitted after that, but when the NACK message is received, the frame is retransmitted.

Unlike the ARQ scheme, when the HARQ scheme is unable to demodulate a received frame, the receiver transmits a NACK message to the transmitter, but the received frame is stored in a buffer for a predetermined time and received when the frame is retransmitted. Combined with one frame, the reception success rate is increased.

Recently, a more efficient HARQ scheme is used more widely than the ARQ scheme. There are various types of HARQ schemes, which can be divided into synchronous HARQ and asynchronous HARQ according to timing of retransmission, and reflect channel state on the amount of resources used for retransmission. It can be divided into channel-adaptive method and channel-non-adaptive method according to whether or not to do so.

9 illustrates a synchronization HARQ.

In the synchronous HARQ scheme, when the initial transmission fails, subsequent retransmission is performed at a timing determined by the system. That is, assuming that the timing of the retransmission is made every eighth time unit (subframe) after the initial transmission, it is not necessary to further inform about this timing because the appointment is already made between the base station and the terminal. However, if the data sender receives a NACK message, the data is retransmitted every eighth time until the ACK message is received.

On the other hand, in the asynchronous HARQ scheme, retransmission timing may be newly scheduled or additional signaling may be performed. The timing at which retransmission is performed for data that has previously failed to be transmitted is changed by various factors such as channel conditions.

The channel adaptive HARQ scheme is a scheme in which data modulation, number of resource blocks, coding schemes, etc., are re-transmitted as specified in the initial transmission. In contrast, the channel non-adaptive HARQ scheme is a scheme in which they vary depending on the channel state. .

For example, the transmitting side transmits data using six resource blocks during initial transmission, and then retransmits using six resource blocks in the same way, and then retransmits the channel non-adaptive HARQ scheme.

On the other hand, although data is initially transmitted using six resource blocks, a channel adaptive HARQ method is a method of retransmitting data using a number of resource blocks larger or smaller than six depending on the channel state. .

According to this classification, a combination of four HARQs can be achieved. However, the HARQ schemes that are commonly used include asynchronous and channel adaptive HARQ schemes, and synchronization and channel non-adaptive HARQ schemes. Asynchronous and channel-adaptive HARQ schemes can maximize retransmission efficiency by adaptively varying retransmission timing and the amount of resources used depending on channel conditions, but the overhead is increased, which is generally considered for uplink. It doesn't work. On the other hand, the synchronization and channel non-adaptive HARQ scheme has the advantage that there is little overhead for this because the timing and resource allocation for retransmission is promised in the system. There are disadvantages to losing.

Currently, in 3GPP LTE, an asynchronous HARQ scheme is used for downlink and a synchronous HARQ scheme is used for uplink.

On the other hand, as an example of the downlink, a time delay occurs as shown in FIG. 9 until the ACK / NACK signal is received from the terminal after the data is transmitted by scheduling and the next data is transmitted again. This is a delay caused by the propagation delay of the channel and the time taken for data decoding and data encoding. A method of transmitting data using an independent HARQ process is used to prevent a gap in data transmission from occurring during such a delay period.

For example, if the shortest period between data transmission and the next data transmission in one HARQ process is 8 subframes, eight independent HARQ processes may be provided to transmit data without a space. In LTE FDD, up to 8 HARQ processes can be allocated when not operating in MIMO.


<Carrier aggregation>

The carrier aggregation system will now be described.

10 is a comparative example of a conventional single carrier system and a carrier aggregation system.

Referring to FIG. 10, in a single carrier system, only one carrier is supported to the terminal in uplink and downlink. The bandwidth of the carrier may vary, but only one carrier is allocated to the terminal. On the other hand, in a carrier aggregation (CA) system, a plurality of CCs (DL CC A to C, UL CC A to C) may be allocated to the UE. A component carrier (CC) means a carrier used in a carrier aggregation system and may be abbreviated as a carrier. For example, three 20 MHz component carriers may be allocated to allocate a 60 MHz bandwidth to the terminal.

The carrier aggregation system may be divided into a continuous carrier aggregation system in which aggregated carriers are continuous and a non-contiguous carrier aggregation system in which carriers aggregated are separated from each other. Hereinafter, simply referred to as a carrier aggregation system, it should be understood to include both the case where the component carrier is continuous and the case where it is discontinuous.

The system frequency band of a wireless communication system is divided into a plurality of carrier frequencies. Here, the carrier frequency means a center frequency of a cell. Hereinafter, a cell may mean a downlink frequency resource and an uplink frequency resource. Alternatively, the cell may mean a combination of a downlink frequency resource and an optional uplink frequency resource. In addition, in general, when a carrier aggregation (CA) is not considered, one cell may always have uplink and downlink frequency resources in pairs.

In order to transmit and receive packet data through a specific cell, the terminal must first complete configuration for the specific cell. In this case, the configuration refers to a state in which reception of system information necessary for data transmission and reception for a corresponding cell is completed. For example, the configuration may include a general process of receiving common physical layer parameters required for data transmission and reception, media access control (MAC) layer parameters, or parameters required for a specific operation in the RRC layer. . When the set cell receives only the information that the packet data can be transmitted, the cell can be immediately transmitted and received.

The cell in the configuration complete state may exist in an activation or deactivation state. Here, activation means that data is transmitted or received or is in a ready state. The UE may monitor or receive a control channel (PDCCH) and a data channel (PDSCH) of an activated cell in order to identify resources (which may be frequency, time, etc.) allocated thereto.

Deactivation means that transmission or reception of traffic data is impossible, and measurement or transmission of minimum information is possible. The terminal may receive system information (SI) required for packet reception from the deactivated cell. On the other hand, the terminal does not monitor or receive the control channel (PDCCH) and data channel (PDSCH) of the deactivated cell in order to check the resources (may be frequency, time, etc.) allocated to them.

The cell may be divided into a primary cell, a secondary cell, and a serving cell.

The primary cell refers to a cell operating at a primary frequency, and is a cell in which the terminal performs an initial connection establishment procedure or connection reestablishment with the base station, or is indicated as a primary cell in a handover process. It means a cell.

The secondary cell refers to a cell operating at the secondary frequency, and is established and used to provide additional radio resources once the RRC connection is established.

The serving cell is configured as a primary cell when the carrier aggregation is not set or the terminal cannot provide carrier aggregation. When carrier aggregation is set, the term serving cell indicates a cell configured for the terminal and may be configured in plural. One serving cell may be configured with one downlink component carrier or a pair of {downlink component carrier, uplink component carrier}. The plurality of serving cells may be configured as a set consisting of one or a plurality of primary cells and all secondary cells.

A primary component carrier (PCC) refers to a component carrier (CC) corresponding to a primary cell. The PCC is a CC in which the terminal initially makes a connection (connection or RRC connection) with the base station among several CCs. The PCC is a special CC that manages a connection (Connection or RRC Connection) for signaling regarding a plurality of CCs and manages UE context, which is connection information related to a terminal. In addition, the PCC is connected to the terminal and always exists in the active state in the RRC connected mode. The downlink component carrier corresponding to the primary cell is called a downlink primary component carrier (DL PCC), and the uplink component carrier corresponding to the primary cell is called an uplink major component carrier (UL PCC).

Secondary component carrier (SCC) refers to a CC corresponding to the secondary cell. That is, the SCC is a CC allocated to the terminal other than the PCC, and the SCC is an extended carrier for the additional resource allocation other than the PCC and may be divided into an activated or deactivated state. The downlink component carrier corresponding to the secondary cell is referred to as a DL secondary CC (DL SCC), and the uplink component carrier corresponding to the secondary cell is referred to as an uplink secondary component carrier (UL SCC).

 The primary cell and the secondary cell have the following characteristics.

First, the primary cell is used for transmission of the PUCCH. Second, the primary cell is always activated, while the secondary cell is a carrier that is activated / deactivated according to specific conditions. Third, when the primary cell experiences a Radio Link Failure (RLF), RRC reconnection is triggered. Fourth, the primary cell may be changed by a security key change or a handover procedure accompanying a RACH (Random Access CHannel) procedure. Fifth, non-access stratum (NAS) information is received through the primary cell. Sixth, in the case of the FDD system, the primary cell is always configured with a pair of DL PCC and UL PCC. Seventh, a different CC may be configured as a primary cell for each UE. Eighth, the primary cell can be replaced only through a handover, cell selection / cell reselection process. In the addition of a new secondary cell, RRC signaling may be used to transmit system information of a dedicated secondary cell.

In the component carrier constituting the serving cell, the downlink component carrier may configure one serving cell, and the downlink component carrier and the uplink component carrier may be connected to configure one serving cell. However, the serving cell is not configured with only one uplink component carrier.

The activation / deactivation of the component carrier is equivalent to the concept of activation / deactivation of the serving cell. For example, assuming that serving cell 1 is configured of DL CC1, activation of serving cell 1 means activation of DL CC1. If the serving cell 2 assumes that DL CC2 and UL CC2 are configured to be configured, activation of serving cell 2 means activation of DL CC2 and UL CC2. In this sense, each component carrier may correspond to a serving cell.

The number of component carriers aggregated between the downlink and the uplink may be set differently. The case where the number of downlink CCs and the number of uplink CCs are the same is called symmetric aggregation, and when the number is different, it is called asymmetric aggregation. In addition, the size (ie bandwidth) of the CCs may be different. For example, assuming that 5 CCs are used for a 70 MHz band configuration, 5 MHz CC (carrier # 0) + 20 MHz CC (carrier # 1) + 20 MHz CC (carrier # 2) + 20 MHz CC (carrier # 3) It may be configured as + 5MHz CC (carrier # 4).

As described above, in a carrier aggregation system, unlike a single carrier system, a plurality of component carriers (CCs), that is, a plurality of serving cells may be supported.

Such a carrier aggregation system may support cross-carrier scheduling. Cross-carrier scheduling is a resource allocation of a PDSCH transmitted on another component carrier through a PDCCH transmitted on a specific component carrier and / or a PUSCH transmitted on a component carrier other than the component carrier basically linked with the specific component carrier. Scheduling method that allows resource allocation. That is, the PDCCH and the PDSCH may be transmitted on different DL CCs, and the PUSCH may be transmitted on another UL CC other than the UL CC linked to the DL CC on which the PDCCH including the UL grant is transmitted. As such, in a system supporting cross-carrier scheduling, a carrier indicator indicating a DL CC / UL CC through which a PDSCH / PUSCH for which PDCCH provides control information is transmitted is required. A field including such a carrier indicator is hereinafter called a carrier indication field (CIF).

A carrier aggregation system supporting cross carrier scheduling may include a carrier indication field (CIF) in a conventional downlink control information (DCI) format. In a system supporting cross-carrier scheduling, for example, in the LTE-A system, since CIF is added to an existing DCI format (that is, a DCI format used in LTE), 3 bits may be extended, and the PDCCH structure may include an existing coding method, Resource allocation methods (ie, CCE-based resource mapping) can be reused.

The base station may set a PDCCH monitoring DL CC (monitoring CC) set. The PDCCH monitoring DL CC set includes some DL CCs among the aggregated DL CCs, and when cross-carrier scheduling is configured, the UE performs PDCCH monitoring / decoding only for DL CCs included in the PDCCH monitoring DL CC set. In other words, the base station transmits the PDCCH for the PDSCH / PUSCH to be scheduled only through the DL CC included in the PDCCH monitoring DL CC set. The PDCCH monitoring DL CC set may be configured UE-specifically, UE group-specifically, or cell-specifically.


<How to send ACK / NACK in HARQ process>

Now, ACK / NACK transmission for HARQ in 3GPP LTE will be described.

In FDD, a terminal supporting aggregation of up to two serving cells transmits ACK / NACK by using PUCCH format 1b with channel selection when two serving cells are configured.

When two or more serving cells are configured, a terminal supporting more than two serving cells transmits ACK / NACK using PUCCH format 1b or PUCCH format 3 using channel selection according to a configuration of a higher layer signal. PUCCH format 1b using channel selection will be described later.

In TDD, unlike a frequency division duplex (FDD), a DL subframe and an UL subframe coexist in one radio frame. In general, the number of UL subframes is less than the number of DL subframes. Accordingly, in case of a lack of UL subframes for transmitting the ACK / NACK signal, a plurality of ACK / NACK signals for a transport block (or a plurality of PDSCHs) received in a plurality of DL subframes are included in one UL subframe. It supports sending in frames. The one or more DL subframes transmit the ACK / NACK for a UL subframe that transmits ACK / NACK and one or more DL subframes that can transmit a transport block (or PDSCH) that is the target of the ACK / NACK. It may be expressed as corresponding (or related / connected) to the subframes.

A terminal that does not support aggregation of two or more serving cells in TDD supports two ACK / NACK modes of bundling and channel selection according to higher layer configuration.

First, bundling is to transmit an ACK when all of the decoding of the PDSCH (ie, downlink transport blocks) received by the UE is successful, and otherwise, transmit an NACK. This is called an AND operation. However, bundling is not limited to an AND operation and may include various operations of compressing ACK / NACK bits corresponding to a plurality of transport blocks (or codewords). For example, bundling may indicate the value of counting the number of ACKs (or NACKs) or the number of consecutive ACKs. Bundling may also be referred to as ACK / NACK bundling.

Secondly, channel selection is also referred to as ACK / NACK multiplexing. In channel selection, the UE selects one PUCCH resource among a plurality of PUCCH resources and transmits ACK / NACK.

The following table is an example of DL subframe n-k associated with UL subframe n according to UL-DL configuration in 3GPP LTE TDD. Here, k ∈ K, M represents the number of elements of the set K.

TABLE 7

Figure PCTKR2013006507-appb-I000009

Assume that M DL subframes are connected to UL subframe n, and consider M = 3. Three PDCCHs may be received from three DL subframes, and the UE may acquire three PUCCH resources n (1) PUCCH, 0 , n (1) PUCCH, 1 , n (1) PUCCH, 2 Can be. Examples of channel selection in TDD are shown in the following table.

TABLE 8

Figure PCTKR2013006507-appb-I000010

In the table, HARQ-ACK (i) indicates ACK / NACK for an i-th downlink subframe among M downlink subframes. DTX (Discontinuous Transmission) means that a DL transport block is not received on a PDSCH or a corresponding PDCCH is not detected in a corresponding DL subframe. According to Table 8, three PUCCH resources n (1 ) PUCCH, 0 , n (1) PUCCH, 1 , n (1) PUCCH, 2 ), and b (0) and b (1) are two bits transmitted using the selected PUCCH.

For example, if the UE successfully receives all three DL transport blocks in three DL subframes, the UE performs QPSK modulation on bits (1,1) using n (1) PUCCH, 2 and onto the PUCCH. send. If the UE fails to decode the DL transport block in the first (i = 0) DL subframe, and the rest succeeds in decoding, the UE transmits bit (1,0) onto the PUCCH using n (1) PUCCH, 2 . send.

In channel selection, if there is at least one ACK, the NACK and the DTX are coupled. This is because a combination of reserved PUCCH resources and QPSK symbols cannot represent all ACK / NACK / DTX states. However, in the absence of an ACK, the DTX decouples from the NACK.

The existing PUCCH format 1b may transmit only 2-bit ACK / NACK. However, PUCCH format 1b using channel selection links a combination of allocated PUCCH resources and modulation symbols (2 bits) with a plurality of ACK / NACK states to indicate more ACK / NACK states.

Meanwhile, when M DL subframes are connected to the UL subframe n, an ACK / NACK mismatch between the base station and the UE may occur due to a missing DL subframe (or PDCCH).

Assume that M = 3 and the base station transmits three DL transport blocks on three DL subframes. The UE may not receive the second transport block at all because it does not detect the PDCCH in the second DL subframe, and may receive only the remaining first and third transport blocks. At this time, if ACK / NACK bundling is used, an error occurs in which the UE transmits an ACK.

In order to solve this error, a Downlink Assignment Index (DAI) is included in the DL grant on the PDCCH. The DAI indicates the cumulative number of PDCCHs with assigned PDSCH transmissions. The value of 2 bits of DAI is sequentially increased from 1, and modulo-4 operation can be applied again from DAI = 4. For example, if M = 5 and all five DL subframes are scheduled, they may be included in the corresponding PDCCH in the order of DAI = 1, 2, 3, 4, 1.

In TDD, when the UL-DL configuration 5 and the terminal does not support two or more serving cell aggregation, only bundling is supported.

In case of a UE supporting two or more serving cell aggregations in TDD, when two or more serving cells are configured, one of PUCCH format 1b (PUCCH format 1b with channel selection) or PUCCH format 3 using channel selection may be used according to a higher layer configuration. Send ACK / NACK.

PUCCH format 1b with channel selection (PUCCH format 1b with channel selection) using channel selection even when a terminal supporting two or more serving cell aggregations in TDD is configured by a higher layer signal to use bundling and one serving cell is configured. ACK / NACK may be transmitted by using one of them according to higher layer configuration.

In case of transmitting ACK / NACK for two or more serving cells through PUCCH format 1b using channel selection, HARQ-ACK (i) and the number of PUCCH resources used for channel selection (denoted as A) as shown in the following table. A mapping table between {PUCCH resources and transmission bits} may be defined.

TABLE 9

Figure PCTKR2013006507-appb-I000011

TABLE 10

Figure PCTKR2013006507-appb-I000012

TABLE 11

Figure PCTKR2013006507-appb-I000013

Table 9 shows A = 2, Table 10 shows A = 3, and Table 11 shows A = 4.

In FDD, a table similar to Tables 9 to 11 is defined and may transmit ACK / NACK accordingly.

In the next generation wireless communication system, machine type communication (MTC), multi-user multi-input multi-output (MU-MIMO), and carrier aggregation between TDD cells using different UL-DL configurations may be used. In addition, the number of terminals scheduled at the same time may be increased.

Thus, there may be a lack of control channels for scheduling existing data channels. In 3GPP LTE, in order to solve the resource shortage of the control channel PDCCH, considering a bundled scheduling for scheduling a plurality of PDSCHs transmitted through a plurality of subframes or cells through a single PDCCH or In order to flexibly utilize the PDCCH, cross-subframe scheduling is considered. Cross-subframe scheduling is to allow the PDCCH scheduling the PDSCH to be transmitted in a subframe other than the subframe in which the PDSCH is transmitted. In addition, the introduction of an enhanced-PDCCH (E-PDCCH) in addition to the existing PDCCH.

<E-PDCCH>

11 shows an example of E-PDCCH allocation.

LTE-A considers assigning and using a new control channel, E-PDCCH, in the data region. The E-PDCCH is a control channel configured in a data region in which a PDSCH is transmitted and may be a control channel for demodulating using a UE-specific reference signal. That is, the E-PDCCH is clearly distinguished from the PDCCH which is an existing control channel in the region to be allocated and the reference signal used for demodulation.

On the other hand, the E-PDCCH also configures Enhanced-CCE (E-CCE) similarly to the PDCCH, and can apply implicit PUCCH resource mapping based on this. The E-CCE is a structural unit constituting the E-PDCCH. The amount of resources included in the E-CCE may be the same as or different from the amount of resources included in the CCE constituting the PDCCH. In addition, when the ARI is included in the E-PDCCH, the indication value using the ARI may be used for explicit PUCCH resource selection.


The present invention will now be described.

As described above, in the LTE system, a frame structure type of the FDD scheme and the TDD scheme exists.

In the case of the FDD scheme, the UL subframe and the DL subframe always exist 1: 1 at the same time. In the case of the TDD scheme, the ratio of the DL subframe and the UL subframe is different for each UL-DL configuration. Therefore, the TDD scheme has an advantage of efficiently utilizing frequency resources according to the traffic ratio of DL / UL.

However, there may be a significant time delay in changing (resetting) the UL-DL configuration. For example, to change the UL-DL configuration, it is necessary to wait for the termination of the existing HARQ process or stop it. Therefore, there is a limit to the operation of adaptively changing the UL-DL configuration when the traffic changes rapidly in real time.

Therefore, a method of applying a flexible UL / DL subframe (dynamic UL / DL subframe) that can dynamically configure whether a subframe is applied to UL / DL, aggregation of cells to which different UL-DL configurations are applied, and an FDD cell (or DL) Methods for utilizing more efficient resources, such as a cell configured only with subframes and a cell configured only with UL subframes) and a TDD cell, are being considered.

When variously configuring the UL-DL configuration of a cell, normal reception for a data channel (eg PDSCH) or a control channel (eg, a control channel requiring an ACK / NACK response, eg, DL SPS release PDCCH) scheduled to DL PUCCH format 1b using channel selection may be used as a method of configuring a plurality of ACK / NACK responses indicating whether or not it is present. In this case, conventionally, uplink transmission power is determined under the assumption that each cell uses the same UL-DL configuration. However, in the future, each cell may use a different UL-DL configuration. Therefore, a new uplink (UL) transmission power control method is needed.

In the existing LTE system, in case of FDD, DL subframes and UL subframes are continuously present in every subframe, and the number thereof is matched 1: 1. Thus, a DL data channel or a DL control channel requiring a UL ACK / NACK response. The ACK / NACK response timing for is kept constant. For example, the ACK / NACK transmitted in subframe n becomes ACK / NACK for the DL data channel or DL control channel of subframe n-4.

On the other hand, in the case of TDD, each subframe becomes a DL subframe or an UL subframe according to the UL-DL configuration (where a special subframe is regarded as a DL subframe for convenience), and the ratio of the DL subframe and the UL subframe There is a case where it does not match 1: 1. Accordingly, the number of DL subframes corresponding to one UL subframe may be plural.

Meanwhile, in a future wireless communication system, a flexible UL / DL subframe application method for dynamically setting whether UL / DL is applied to a subframe, aggregation of cells configured with different UL-DL configurations, aggregation of FDD cells and TDD cells For example, a method for utilizing more efficient cell resources may be used. In this case, the FDD / TDD DL HARQ-ACK timing (hereinafter, referred to as ACK / NACK timing) may vary according to a location setting of a scheduling cell to perform scheduling, a cell to be scheduled, and a cell to transmit ACK / NACK.

In order to simplify the relationship between the ACK / NACK timing, the ACK / NACK timing defined in the following table can be used.

TABLE 12

Figure PCTKR2013006507-appb-I000014

In the table, since the aggregation between the FDD cells and the TDD cells is allowed in the LTE-A Rel-11, the ACK / NACK timing of the last row may be excluded, and if the aggregation of the next FDD and TDD cells is allowed, the last row of the table may also be excluded. Applicable.

12 shows examples of ACK / NACK timing in aggregation of cells using different UL-DL configurations.

Referring to FIG. 12, UL-DL configuration 4 may be used for the primary cell and UL-DL configuration 3 may be used for the secondary cell.

Each cell may use a first UL-DL configuration for determining a subframe structure in a frame and a second UL-DL configuration for determining ACK / NACK timing. The first UL-DL configuration may be a cell specific UL-DL configuration configured through system information block 1 (SIB1) of a corresponding cell. The second UL-DL configuration may be a reference UL-DL configuration for determining a DL subframe corresponding to ACK / NACK. In FIG. 12, an arrow connecting two subframes connects a DL subframe and an UL subframe that transmits ACK / NACK for the DL subframe, and the number described in the arrow indicates the UL based on the DL subframe. It shows how many subframes are after a subframe (the same also in FIGS. 13-15).

13 and 14 show examples of cell-specific UL-DL configuration and reference UL-DL configuration in primary and secondary cells.

For example, the cell-specific UL-DL configuration (first UL-DL configuration) of the secondary cell is UL-DL configuration 3, and the reference UL-DL configuration (second UL-DL used for determining the ACK / NACK timing). Setting) may be UL-DL setting 4.

In this case, although the ACK / NACK timing is defined by the second UL-DL configuration, unnecessary ACK / NACK timing may occur when the first UL-DL configuration is used.

13 to 14, subframe four 122 of the secondary cell is a UL subframe according to the first UL-DL configuration, but is a DL subframe according to the second UL-DL configuration. That is, the subframe 4 122 is assumed to be a DL subframe according to the second UL-DL configuration, and a corresponding ACK / NACK timing is given. However, according to the first UL-DL configuration, since subframe four 122 is a UL subframe, DL data or a control channel is not transmitted by the base station in subframe four 122. Therefore, it may not be necessary to secure A / N transmission resources for the subframe 4 (122).

When the UE applies PUCCH format 1b using channel selection, the DL subframe targeted for ACK / NACK may be determined by one of the following methods.

1. For cell c, DLs subject to ACK / NACK transmitted in the UL subframes are DL subframes corresponding to Kc defined in the UL subframes according to Table 12 based on a cell-specific UL-DL configuration. Subframes may be determined. When the number of elements of K c is M c , the number of DL subframes corresponding to the UL subframe is M c . That is, DL subframes corresponding to UL subframes and ACK / NACK timing are determined according to the first UL-DL configuration.

2. For cell c, transmit DL subframes corresponding to K REF, c defined in UL subframes according to Table 12 based on the UL-DL configuration used for ACK / NACK timing determination in the UL subframe. DL subframes targeted for ACK / NACK may be determined. When the number of elements of K REF, c is M REF, c , the number of DL subframes corresponding to the UL subframe is M REF, c . That is, DL subframes corresponding to UL subframes and ACK / NACK timing are determined according to the second UL-DL configuration.

3. For cell c, first determine DL subframes corresponding to K REF, c defined in UL subframes according to Table 12 based on UL-DL configuration used for ACK / NACK timing determination, and then use a valid DL. Only subframes may be determined as DL subframes targeted for ACK / NACK transmitted in the UL subframe.

A valid DL subframe is a DL subframe that is not an invalid DL subframe. As described above, the invalid DL subframe may be defined as an ACK / NACK timing according to the second UL-DL configuration, but may be a DL subframe in which unnecessary ACK / NACK timing is generated according to the first UL-DL configuration. .

Let the set of invalid DL subframes included in K REF, c be K invalid REF, c and the set of valid DL subframes be K valid REF, c . Let the number of elements of K REF, c be M REF, c , and the number of elements of K valid REF, c be M valid REF, c , and the number of elements of K invalid REF, c be M invalid REF, c . Then M valid REF, c = M REF, c -M invalid REF, c .

M REF, c is the number of elements of K in the DL subframe nk i corresponding to the UL subframe n, which is the ACK / NACK transmission subframe for the serving cell c and the second UL-DL configuration. M valid REF, c is the number of DL subframes valid in the DL subframe nk i corresponding to the UL subframe n, which is an ACK / NACK transmission subframe for the serving cell c and the second UL-DL configuration. M invalid REF, c is the number of invalid DL subframes in the DL subframe nk i corresponding to the UL subframe n, which is an ACK / NACK transmission subframe for the serving cell c and the second UL-DL configuration.

The method of 1. is to determine a DL subframe for ACK / NACK transmission according to a cell-specific UL-DL configuration (first UL-DL configuration), and can transmit ACK / NACK for some subframes of the secondary cell. If not, it can happen. The method of 2. is to determine the DL subframe for the ACK / NACK transmission according to the second UL-DL configuration, there is a disadvantage that the ACK / NACK for the unnecessary link because the actual schedule is impossible. However, there is an advantage in that ACK / NACK can be transmitted regardless of whether a subframe that is different for each combination of UL-DL configurations is valid. The method of 3. is determined according to the second UL-DL configuration, and determines the DL subframe for ACK / NACK transmission only as a valid DL subframe, which can effectively transmit ACK / NACK since it excludes unnecessary ACK / NACK. .

The validity / invalidity of the DL subframe may be determined based on whether DL data (and / or DL control information) can be transmitted in a carrier aggregation situation. Whether the DL subframe is valid or invalid when the second UL-DL configuration is configured may be determined as follows. For convenience of description, special subframes are considered separately.

Subframes in which transmission directions according to cell-specific UL-DL configuration (first UL-DL configuration) do not coincide with transmission directions according to reference UL-DL configuration (second UL-DL configuration) In this case, the UE may designate a subframe that does not use the corresponding subframe (called X subframe). That is, the X subframe is an unused subframe. For example, when carrier aggregation is applied to a terminal supporting half-duplex, cell-specific UL-DL configuration transmitted through SIB of each of a plurality of aggregated cells may be different. For example, when cells A and B are carrier aggregated, a subframe may be used as 'D' according to UL-DL configuration of cell A and used as “U” according to UL-DL configuration of cell B. That is, subframes having different transmission directions may occur in a plurality of cells. These subframes become subframes that the UE cannot use.

A case in which UEs configured with different UL-DL configurations are aggregated and operates in full duplex will be described.

If the reference UL-DL configuration of cell c is the same as the cell specific UL-DL configuration, and there is no restriction on special DL subframe scheduling. M invalid REF, c = 0. Non-cross carrier scheduling may be an example, and a primary cell may be an example.

If cell c is cross-carrier scheduled and the n-ki subframe of the scheduling cell being scheduled is not a DL subframe, this subframe becomes an invalid DL subframe. However, it is assumed that cross subframe scheduling or bundled subframe scheduling is not supported.

If the reference UL-DL configuration of cell c is different from the cell-specific UL-DL configuration, the DL subframe may not be generated when the n-ki subframe defined according to the reference UL-DL configuration is due to the cell-specific UL-DL configuration. Otherwise this subframe becomes an invalid DL subframe.

For example, if the DL subframe in the cell-specific UL-DL configuration in the secondary cell is a subset of subframes that are DL subframes according to the cell-specific UL-DL configuration of the primary cell, the reference UL of the secondary cell -DL configuration may be UL-DL configuration of the primary cell. In this case, the DL subframes of the secondary cell that are not the intersection with the effective DL subframe of the primary cell become an invalid DL subframe.

For example, in the cell-specific UL-DL configuration of the secondary cell and the UL subframe intersection of the cell-specific UL-DL configuration of the primary cell (ie, a set of subframes in which both the primary cell and the secondary cell are UL subframes). The UL-DL configuration of Table 12 including all UL subframes may be the reference UL-DL configuration of the secondary cell. Preferably, the largest number of UL subframes (relative to DL subframes) may be selected. A subframe that does not correspond to the reference UL-DL configuration and the DL subframe intersection (the subframe configured as the UL subframe in both the cell specific and the reference UL-DL configuration) becomes an invalid subframe of the secondary cell.


A case of a terminal operating in half duplex in carrier aggregation between cells in which different UL-DL configurations are configured will be described.

Even if the reference UL-DL configuration of the cell c is the same as the cell-specific UL-DL configuration, an X subframe may occur according to a transmission direction of aggregated cells, and the X subframe becomes an invalid subframe.

The primary cell has the same cell-specific UL-DL configuration as the reference UL-DL configuration. When the transmission direction of the primary cell is applied to the aggregated secondary cell, the X subframe does not occur in the primary cell. Therefore, when the transmission direction of the primary cell is applied to other aggregated cells, the X subframe does not occur in the primary cell and M invalid REF, c = 0.

In the case of the secondary cell, the DL subframe according to the cell-specific UL-DL configuration of the cell c becomes an invalid subframe because it does not match the reference UL-DL configuration, and the cell-specific UL-DL configuration and the aggregation of the transmitted cells X subframes generated due to different directions may be invalid subframes.

When the reference UL-DL configuration of cell c is different from the cell-specific UL-DL configuration, when the subframe nk i defined in the reference UL-DL configuration is not a DL subframe when the cell-specific UL-DL configuration is followed. This subframe may be an invalid DL subframe. In addition, in case of an X subframe generated due to a different transmission direction of cell-specific UL-DL configuration and aggregated cells, the subframe may be an invalid subframe.

For example, if the DL subframe in the cell-specific UL-DL configuration of the secondary cell is a subset of the DL subframes according to the cell-specific UL-DL configuration of the primary cell, the reference UL-DL configuration of the secondary cell May be a cell-specific UL-DL configuration of the primary cell. In this case, a subframe of the secondary cell that is not an intersection with the effective DL subframe of the primary cell becomes an invalid subframe. Here, the case where the DL subframe becomes an X subframe does not occur.

For example, as in the case of the full duplex, the UL subframe intersection of the cell-specific UL-DL configuration of the cell c, which is the secondary cell, and the cell-specific UL-DL configuration of the primary cell (in both PCell and SCell at the same subframe timing). The UL-DL configuration of Table 12 in which all UL subframes are included in the UL subframe may be the reference UL-DL configuration of the secondary cell. Preferably, the largest number of UL subframes (vs. DL subframes) may be selected. In this case, the subframe of the secondary cell, which is not the reference UL-DL configuration and the DL subframe intersection, becomes an invalid subframe.

In addition, if a cell-specific UL-DL configuration and aggregated cells transmit directions different, an X subframe may become an invalid subframe.

15 shows an example of distinguishing an invalid DL subframe and a valid DL subframe.

Referring to FIG. 15, when the reference UL-DL configuration is UL-DL configuration 4 and the cell-specific UL-DL configuration is UL-DL configuration 3, the UL subframe 151 indicated by X becomes an invalid subframe.

Now, a transmission power determination method of the uplink control channel will be described.

[Transmission Power Control of PUCCH]

When the serving cell c is the primary cell, the PUCCH transmit power P PUCCH in subframe i of the UE may be determined as follows.

[Equation 3]

Figure PCTKR2013006507-appb-I000015

In the above equation, P CMAX, c (i) is a transmission power set to the UE in subframe i of the serving cell c.

Δ F_PUCCH (F) is provided in the upper layer, and the value of Δ F_PUCCH (F) is a value corresponding to the PUCCH format (F) based on the PUCCH format 1a. Δ TxD (F ′) is a value given by the higher layer when the UE is configured to transmit the PUCCH in two antenna ports by the higher layer and 0 otherwise.

P O_PUCCH is a value given by a higher layer, and g (i) is a current PUCCH power control adjustment state. PL c is the value for path loss.

h (n CQI , n HARQ , n SR ) is a value dependent on the PUCCH format, n CQI corresponds to the number of CQI information bits, and n SR is 1 or 0 if SR is configured in subframe i.

n HARQ indicates the number of ACK / NACK bits transmitted in subframe i when one serving cell is configured for the UE. Otherwise, it is determined as follows.

1) In FDD, if two serving cells are configured in a terminal and PUCCH format 1b using channel selection is configured, or two or more serving cells are configured and PUCCH format 3 is configured, n HARQ is determined as follows.

[Equation 4]

Figure PCTKR2013006507-appb-I000016

In the above equation, N DL cells are the number of configured cells, and N received c is the number of transport blocks received in subframe n-4 of the serving cell c or the number of SPS release PDCCHs.

That is, in case of transmitting ACK / NACK for the transport blocks received in subframe n-4 of each configured cell and the SPS release PDCCH through the PUCCH in subframe n, n HARQ for determining PUCCH transmission power is expressed as in the above equation. It is decided.

2) In TDD, when 2 serving cells are configured and PUCCH format 1b using channel selection is set and M value in subframe n is 1, or when UL-DL configuration 0 is used and PUCCH format 3 is set, HARQ Is determined by the following equation.

[Equation 5]

Figure PCTKR2013006507-appb-I000017

In the above equation, N received k, c is the number of transport blocks received in subframe nk (kDCK) of the serving cell c or the number of SPS release PDCCHs. M is the number of elements of K.

In TDD, when UL-DL configuration 1 to 6 and PUCCH format 3 are configured or two serving cells are configured and PUCCH format 1b using channel selection is set and M = 2, n HARQ is determined as follows. .

[Equation 6]

Figure PCTKR2013006507-appb-I000018

In the above equation, V DL DAI, c represents the V DL DAI of the serving cell c, and the terminal is the DCI format 1 / of the subframe nk m (k m is the set K (see Table 7, below)) of the serving cell c. PDCCH / E-PDCCH with DCI format 1 / 1A / 1B / 1D / 2 / 2A / 2B / 2C / 2D in 1A / 1B / 1D / 2 / 2A / 2B / 2C / 2D Means the DAI value (the same below). U DAI, c is U DAI of the serving cell c, and the total number of PDCCH / E-PDCCH and PDCCH / E-PDCCH related to PDSCH transmission in subframe nk (k∈K) of the serving cell c indicates the release of the PDCCH / E-PDCCH. (The same applies below). n ACK c is the number of ACK / NACK bits corresponding to the DL transmission mode configured in the serving cell c. When spatial bundling is applied to ACK / NACK, n ACK c = 1. N received k, c is the number of PDCCHs received in subframe nk (k∈K c ) of serving cell c or the number of PDSCHs without corresponding PDCCHs. M c is the number of elements of K c . If the ACK / NACK bundling in a space not applied, it received N k, c is the number of the serving cell c in the sub-frame nk (k∈K c) the number of PDCCH or SPS release of the transport block received on. M c is the number of elements of K c . If no transport block or SPS release PDCCH is detected in subframe nk (k∈K c ) of serving cell c, V DL DAI, c = 0.

In TDD, if two serving cells are configured and PUCCH format 1b using channel selection is set and M = 3 or 4, if the UE receives PDSCH or DL SPS release PDCCH in subframe nk in only one serving cell n HARQ is 2, otherwise n HARQ is 4.

H (n CQI , n HARQ , n SR ) is 0 for PUCCH formats 1, 1a, and 1b.

For PUCCH format 1b using channel selection, if two or more serving cells are configured by the UE , h (n CQI , n HARQ , n SR ) is (n HARQ -1) / 2 and 0 otherwise.

For PUCCH formats 2, 2a, 2b and normal CP, h (n CQI , n HARQ , n SR ) is given by the following equation.

[Equation 7]

Figure PCTKR2013006507-appb-I000019

For PUCCH formats 2, 2a, 2b and extended CP, h (n CQI , n HARQ , n SR ) is given by the following equation.

[Equation 8]

Figure PCTKR2013006507-appb-I000020

For PUCCH format 3, h (n CQI , n HARQ , n SR ) is set if it is set by a higher layer to transmit PUCCH through two antenna ports or if the UE transmits ACK / NACK and SR greater than 11 bits. Equation 9 is given, otherwise, it is given as Equation 10.

[Equation 9]

Figure PCTKR2013006507-appb-I000021

[Equation 10]

Figure PCTKR2013006507-appb-I000022

Meanwhile, in the above-described method of determining the transmit power of the PUCCH, when a plurality of cells are configured for the UE in TDD, it is assumed that the UL-DL configurations of the plurality of cells are the same. The parameter n HARQ, which is a parameter required to determine the transmit power of the PUCCH transmitted in subframe n, may vary according to M value. When the UL-DL configuration of the plurality of cells is the same, in the same subframe of the plurality of cells, M values are the same. However, if the UL-DL configuration of the plurality of cells is different, the M value may be different in the same subframe of the plurality of cells.

Now, a description will be given of how to determine the PUCCH transmission power when a plurality of cells are configured for the UE in TDD and at least two cells of the plurality of cells have different UL-DL configurations.

16 illustrates a PUCCH transmission power determination method according to an embodiment of the present invention.

Referring to FIG. 16, the UE may determine the number N1 of downlink subframes corresponding to the subframe n of the first cell having the first UL-DL configuration and the subframe n of the second cell having the second UL-DL configuration. A large value is selected from the number N2 of downlink subframes corresponding to S110. If the selected value is M, then M = max (N1, N2). The first cell may be a primary cell in which the terminal performs an initial connection establishment procedure or a connection reestablishment procedure with the base station, and the second cell may be a secondary cell added to the primary cell.

Thereafter, based on the selected value, a parameter n HARQ for determining a transmission power of an uplink control channel (PUCCH) transmitted in the subframe n is determined (S120). PUCCH may be transmitted only through the primary cell. In this case, the parameter n HARQ for determining the transmit power of the uplink control channel (PUCCH) is for determining the transmit power of the PUCCH transmitted in subframe n of the primary cell. The terminal may determine the transmit power of the PUCCH based on the parameter. The process of determining the transmit power of the PUCCH has been described with reference to Equations 3 to 10.

For example, the selected value M may be 3 or 4, wherein a value of a parameter for determining the transmit power of the PUCCH is a subframe of only one of the first cell and the second cell. In nk (k ∈ K, K is shown in Table 7), 2 is received when a control channel indicating release of a data channel or semi-static scheduling is 4, and 4 otherwise.

For example, in TDD, if two serving cells are configured in the terminal and PUCCH format 1b using channel selection is set and M = 3 or 4, the terminal subframes a PDSCH or DL SPS release PDCCH in only one serving cell. n HARQ is 2 if received in nk, n HARQ is 4 otherwise. In other words, the value of the parameter is greater when the first cell and the second cell have the same UL-DL configuration (that is, the greater of the N1 and N2 of the first UL-DL configuration and the second UL-DL configuration). In the case where the first cell and the second cell have a UL-DL configuration that provides a common value, the parameter may determine the transmission power of the uplink control channel transmitted in subframe n. The terminal transmits ACK / NACK using PUCCH format 1b using channel selection at M = 4 or 3.

The first cell may be a primary cell in which the terminal performs an initial connection establishment procedure or a connection reestablishment procedure with the base station, and the second cell may be a secondary cell added to the primary cell.


Hereinafter, various examples in which the UE transmits ACK / NACK and determines parameter n HARQ for determining PUCCH transmission power according to a combination of M values that may be provided in a plurality of cells configured for the UE will be described.

Conventionally, when two cells having the same UL-DL configuration are aggregated, the following method is used when applying PUCCH format 1b using channel selection.

1) When M = 3, 4: The number of consecutive ACKs for the data / control channel scheduled for the DL subframe of each cell is transmitted by the channel selection method. Here, when the cell's transmission mode can transmit two transport blocks, the number of spatially bundled ACKs is counted.

2) When M = 2: A total of four ACK / NACKs for two DL subframes of each cell are transmitted in a channel selection scheme. If a cell's transmission mode can transmit two transport blocks, it transmits a spatially bundled ACK / NACK.

3) When M = 1: The number of resources used for channel selection is determined according to the maximum number of transport blocks scheduled in each cell. If the number of transport blocks transmitted in two cells is expressed as (the number of TBs in the first cell and the number of TBs in the second cell), the number of resources is 2 resources, (1 TB, 2 TB) or (1 TB, 1 TB). In the case of (2TB, 1TB), a channel selection method using three resources and (2TB, 2TB) is used.

These methods are intended to transmit possible unbundled ACK / NACK with the assumption that it will be scheduled to the maximum.

If the data / control channel scheduled to the actual UE is not the maximum, the number of assumptions tested by the base station during decoding is reduced, and unnecessary power waste may occur when the transmission power of the PUCCH is configured according to the maximum number of assumptions. Data / control channels that are not scheduled by the base station may always be mapped to NACK, thereby not changing the selection of PUCCH resources and properties.

For example, when M = 3 or 4, when only the primary cell is scheduled, ACK / NACK for the secondary cell is fixed to NACK, and only ACK / NACK for the primary cell is considered. Only power is needed. Accordingly, the UE determines n HARQ in consideration of the actual scheduled state in which ACK / NACK occurs and allocates power proportional thereto to the PUCCH.

Although already described above, once again, if the conventional TDD aggregates two cells having the same UL-DL configuration and the UE transmits ACK / NACK using PUCCH format 1b using channel selection, According to the M value determined accordingly, n HARQ is determined as follows.

1) When M = 1: The sum of the number of codewords (transport blocks) received and the control channel requesting the ACK / NACK response. The same is true for FDD.

2) M = 2: Even when two codewords are received, ACK / NACKs for the two codewords are transmitted in one ACK / NACK with spatial bundling applied. The number of control channels received by the UE (including the PDCCH scheduling the PDSCH, the SPS activation PDCCH, and the SPS release PDCCH), the number of PDSCHs without a corresponding control channel, and the control channel determined that the UE has failed to receive the DL DAI value. Sum of the number of possible inferences).

3) When M> 2: when the UE determines that the scheduling has been received through only one cell (that is, when the data channel and the control channel requiring the ACK / NACK response are all received through only one cell), 2, In other cases, it is 4.


On the other hand, it is assumed that the aggregated two serving cells x, y. In addition, it is assumed that DL subframes to which ACK / NACK is transmitted in one UL subframe are Mx and My in cells x and y, respectively. In this case, Mx and My may be determined by any of the above 1. to 3.

When Mx and My are different values, n HARQ may use one of the following methods.

Mx of the primary cell can always be applied to the method of 1. and the secondary cell My can be applied to the method of 2. or the method of 3.

Hereinafter, an optimal transmission power allocation method will be described according to a combination of (Mx, My).

Hereinafter, the SPS may be applied to the secondary cell. When the SPS is applied only to the primary cell, the SPS related content may be excluded from the information on the cell corresponding to the secondary cell.


I. When (Mx, My) = (4, 1) or (3, 1).

The M value is determined according to the maximum value of Mx and My. That is, M = max (Mx, My). Thereafter, ACK / NACK is transmitted using PUCCH format 1b using channel selection at M = 4 or 3.

1.1.A. Optimal power allocation method.

When the UE is scheduled in both cells, the number of ACKs can be 0 (4), 1, 2, 3 by successive ACK counting for cell x, so a total of four hypotheses are required. Do. On the other hand, the possible values in the continuous ACK counting for cell y are 0 and 1, and two assumptions are required.

The total number of hypotheses determined by channel selection is 8, where n n HARQ = 3.

When the UE is scheduled for only one cell, four possible assumptions are needed because possible values are 0 (4), 1, 2, and 3 by continuous ACK counting for the cell x. Thus, n HARQ = 2. Since possible values are 0 and 1 due to continuous ACK counting for cell y, two assumptions are required and n HARQ = 1.

Since the maximum number of households is set, unnecessary power allocation can be reduced.

That is, when the terminal is scheduled for two serving cells, n HARQ = 3 since {Mp, Ms} = {1,4}, {1,3}, {4,1} or {3,1}. Mp is the M value in the primary cell and Ms is the M value in the secondary cell. If the UE is scheduled only one serving cell and M = 1, n HARQ = 1. If the terminal is scheduled only one serving cell and M = 3, or 4, n HARQ = 2.

This can be summarized as follows.

[Equation 11]

Figure PCTKR2013006507-appb-I000023

Here, if the UE receives the SPS release PDCCH or PDSCH in the subframe nk (k∈K x ) of the serving cell x, n x = 2. Otherwise, n x = 0. N received k, y is the number of PDCCHs received in subframe nk (k∈K y ) of serving cell y or the number of PDSCHs without corresponding PDCCHs.

When transmitting a continuous ACK counting number for the cell x in a channel selection scheme, 1) when only one subframe is scheduled with a PDCCH having DAI = 1 (for example, PDSCH or DAI = scheduled with a PDCCH having DAI = 1). 2) In case of receiving a DL SPS release PDCCH of 1 or 2) a PDSCH without a corresponding PDCCH in only one subframe, the number of consecutive ACK counting becomes 0 or 1. FIG. Reflecting this, n HARQ = 2 when scheduling both cells, and n HARQ = 1 when only cell x is scheduled.

If the UE does not receive the last PDCCH scheduled by the base station (for example, all PDCCHs having DAI> 1 when there is no SPS PDSCH, or all PDCCHs having DAI> 1 when there is an SPS PDSCH), performance degradation may occur. Can be.

If this is expressed as an expression, it is as follows.

[Equation 12]

Figure PCTKR2013006507-appb-I000024

In the above equation, if the UE receives more than one PDSCH, n x = 2. The UE receives only one PDSCH without a corresponding PDCCH in the subframe nk (k ∈ K x ) of the serving cell x, or receives a PDSCH scheduled by a PDCCH having a DAI = 1, or a DL SPS release PDCCH having a DAI = 1. N x = 1 when only one is received. Otherwise, n x = 0. N received k, y is the number of PDCCHs received in subframe nk (k∈K y ) of serving cell y or the number of PDSCHs without corresponding PDCCHs.


1.1.B

When the UE is scheduled for both serving cells, it is optimal to determine n HARQ in consideration of the values that the number of consecutive ACKs may have. However, this method has a disadvantage of high complexity.

Therefore, so as not to change the value of n HARQ in accordance with the change of the value of My, it may equally determine the n HARQ in the case of an existing M = 3, 4.


Or you can use the optimal method for Mx and My. That is, in the case of ACK / NACK corresponding to cell x, the number of consecutive ACKs is transmitted in the channel selection scheme as in the case of M = 4 or 3, and the ACK / NACK corresponding to cell y is transmitted as in the case of M = 1. According to the number of blocks, two transport blocks may be mapped to two ACK / NACKs, and one transport block may be mapped to one ACK / NACK.

1.2.A. Optimal power allocation method.

When the UE is scheduled for both cells, the number of consecutive ACK countings for the cell x may be 0 (4), 1, 2, 3. The ACK / NACK for cell y transmits two ACK / NACKs upon reception of two transport blocks. The candidate values are (A, A), (A, N), (N, A), (N, N ) 4 total. If one transport block is received, one ACK / NACK is transmitted. There are two candidate values, ACK or NACK.

Therefore, the sum of each candidate value is 8 (when cell y receives 2 transport blocks) or 6 (when cell y receives 1 transport block). Thus, each optimal n HARQ = 4 or 3.

If the UE is scheduled only one cell, n HARQ = 2 when only cell x is scheduled, and when only cell y is scheduled, n HARQ = 2, or 1 depending on whether two or one transport blocks are received. Becomes

If this is expressed as an expression, it is as follows.

[Equation 13]

Figure PCTKR2013006507-appb-I000025

If the UE receives the DL SPS release PDCCH or PDSCH in the subframe nk (k∈K x ) of the serving cell x, n x = 2. Otherwise, n x = 0. N received k, y is the number of DL SPS release PDCCHs of a transport block received in subframe nk (k∈K y ) of serving cell y.

When the number of consecutive ACKs for the cell x is transmitted by channel selection, 1) when only one subframe is scheduled with a PDCCH having DAI = 1 (for example, PDSCH or DAI = scheduled with a PDCCH having DAI = 1). 2) In case of receiving a DL SPS release PDCCH of 1 or 2) a PDSCH without a corresponding PDCCH in only one subframe, the number of consecutive ACK counting becomes 0 or 1. FIG. Reflecting this, when both cells are scheduled, n HARQ = 3 (when cell y can transmit 2 transport blocks) or n HARQ = 2 (when cell y can transmit 1 transport block). When only cell x is scheduled, n HARQ = 1.

If this is expressed as an expression, it is as follows.

[Equation 14]

Figure PCTKR2013006507-appb-I000026

In the above equation, if the UE receives more than one PDSCH, n x = 2. The UE receives only one PDSCH without a corresponding PDCCH in the subframe nk (k ∈ K x ) of the serving cell x, or receives a PDSCH scheduled by a PDCCH having a DAI = 1, or a DL SPS release PDCCH having a DAI = 1. N x = 1 when only one is received. Otherwise, n x = 0. N received k, y is the number of transport blocks received in subframe nk (k∈K y ) of serving cell y or the number of PDSCHs (SPS Release PDSCHs) without corresponding PDCCH.

1.2B: Simplified Power Allocation Method.

When the UE is scheduled for both serving cells, it is optimal to determine n HARQ in consideration of the values that the number of consecutive ACKs may have. However, this method has a disadvantage of high complexity. Therefore, so as not to change the value of n HARQ in accordance with the change of the value of My, it is possible to determine the same n HARQ in the case of M = 4, or 3; If two serving cells have different UL-DL configurations and M values are different, the transmission power of the PUCCH may be determined by the method described with reference to FIG. 16.


II. If (Mx, My) = (4, 2) or (3, 2).

2.1.A: Optimal Power Allocation Method.

When the UE is scheduled for both cells, the number of consecutive ACK countings for the cell x may be 0 (4), 1, 2, 3. The number of consecutive ACK countings for cell y is 0, 1, 2. Therefore, the total number distinguishable by channel selection is 12, and the optimal n HARQ = 4.

When the UE is scheduled for only one cell, the number of consecutive ACK countings for the cell x is four (0 (4), 1, 2, 3). Thus, n HARQ = 2. Since the number of consecutive ACK countings for the cell y is three, such as 0, 1, and 2, n HARQ = 2.

If this is expressed as an expression, it is as follows.

[Equation 15]

Figure PCTKR2013006507-appb-I000027

In the above equation, if the UE receives the DL SPS release PDCCH or PDSCH in subframe nk (k∈K x ) of the serving cell x, n x = 2. Otherwise, n x = 0. If the UE receives the DL SPS release PDCCH or PDSCH in subframe nk (k∈K y ) of serving cell y, n y = 2. Otherwise, n y = 0.

In case of transmitting the continuous ACK counting number for the cell x, y by channel selection, 1) when only one subframe is scheduled with a PDCCH having DAI = 1 (for example, a PDSCH scheduled with a PDCCH having DAI = 1 or DL SPS release PDCCH with DAI = 1) or 2) If a PDSCH without a corresponding PDCCH is received only in one subframe, the number of consecutive ACK counting becomes 0 or 1. FIG. Reflecting this, when scheduling both cells, n HARQ = 2 (when DAI = 1 in both cells) or 3 (when only one cell is DAI = 1) or n HARQ = 1 when only one cell is scheduled do.

If this is expressed as an expression, it is as follows.

[Equation 16]

Figure PCTKR2013006507-appb-I000028

In the above equation, if the UE receives more than one PDSCH, n x = 2. The UE receives only one PDSCH without a corresponding PDCCH in the subframe nk (k ∈ K x ) of the serving cell x, or receives only a PDSCH scheduled by a PDCCH having DAI = 1, or a DL SPS release PDCCH having DAI = 1. N x = 1 when only one is received. Otherwise, n x = 0. And, if the terminal receives two or more PDSCH in the subframe nk (k ∈ K y ) of the serving cell y, n y = 2. Or n y = 1 when only one PDSCH without a corresponding PDCCH is received, or only a PDSCH scheduled by a PDCCH having DAI = 1 is received, or only one DL SPS release PDCCH having DAI = 1 is received. In other cases, n y = 0.


2.1 B: Simplified Power Allocation Method.

It is the same as the optimal power allocation method.


On the other hand, it is possible to use the optimal method for each Mx, My. That is, in the case of ACK / NACK corresponding to cell x, the number of consecutive ACKs is transmitted in the channel selection method as in the case of M = 4 or 3, and the ACK / NACK corresponding to cell y is 2 as in the case of M = 2. A total of two ACK / NACKs for the two subframes are transmitted in a channel selection scheme. If there can be two transport blocks in each subframe, spatially bundled ACK / NACK can be used.


2.2.A: Optimal Power Allocation Method.

When the UE is scheduled for both cells, the number of consecutive ACK countings for the cell x may be 0 (4), 1, 2, 3 and a total of four. The combination of ACK / NACK may vary according to the number of subframes actually scheduled in cell y. If both subframes are scheduled, four types such as (A, A), (A, N), (N, A), and (N, N) are possible. If only one subframe is scheduled and the subframe is the previous subframe, (A, N), (N, N) is possible, and the subsequent subframe is (N, A), (N, N). Do. Thus, the total number of branches of ACK / NACK is 4 (when 2 subframes are scheduled), or 2 (when only one subframe is scheduled). Accordingly, the total ACK / NACK combination is 8 or 6. Thus, the optimum n HARQ = 4 or 3 is obtained.

If the UE is scheduled for only one cell, the number of consecutive ACK countings for the cell x may be 0 (4), 1, 2, 3 and a total of four. Thus, n HARQ = 2. Since the number of consecutive ACK countings for cell y is three, such as 0, 1, and 2, n HARQ = 2.

The number of scheduled subframes may include those inferred through the DL DAI.

If this is expressed as an expression, it is as follows.

Formula 17

Figure PCTKR2013006507-appb-I000029

In the above equation, when the UE receives the PDSCH or DL SPS release PDCCH in the subframe nk (k ∈ K x ) of the serving cell x, n x = 2. Otherwise n x = 0. V DAI DL, y represents the V DL DAI of the serving cell y. U DAI, y is U DAI of the serving cell y. n ACK y is the number of ACK / NACK bits corresponding to the DL transmission mode configured in the serving cell y. When spatial bundling is applied to ACK / NACK, n ACK y = 1. And, received N k, y is the number of PDSCH or not the number corresponding to the PDCCH received in sub-frame nk (k∈K y) of the serving cell y PDCCH. If no transport block or SPS release PDCCH is detected in subframe nk (k∈K y ) of serving cell y, V DL DAI, y is 0.

When the number of consecutive ACKs for the cell x is transmitted by channel selection, 1) when only one subframe is scheduled with a PDCCH having DAI = 1 (for example, PDSCH or DAI = scheduled with a PDCCH having DAI = 1). 2) In case of receiving a DL SPS release PDCCH of 1 or 2) a PDSCH without a corresponding PDCCH in only one subframe, the number of consecutive ACK counting becomes 0 or 1. FIG. Reflecting this, if both cells are scheduled, n HARQ = 4 (when two subframes are scheduled in cell y) or n HARQ = 3 (when only one subframe is scheduled in cell y).

If this is expressed as an expression, it is as follows.

[Equation 18]

Figure PCTKR2013006507-appb-I000030

In the above equation, when the UE receives two or more PDSCHs, n x = 2. UE receives only one PDSCH without corresponding PDCCH in subframe nk (k ∈K x ) of serving cell x, or receives only one PDSCH scheduled by PDCCH with DAI = 1, or DL SPS with DAI = 1 N x = 1 when the PDCCH is received. Otherwise n x = 0. V DAI DL, y represents the V DL DAI of the serving cell y. U DAI, y is U DAI of the serving cell y. n ACK y is the number of ACK / NACK bits corresponding to the DL transmission mode configured in the serving cell y. When spatial bundling is applied to ACK / NACK, n ACK y = 1. And, received N k, y is the number of PDSCH or not the number corresponding to the PDCCH received in sub-frame nk (k∈K y) of the serving cell y PDCCH. If no transport block or SPS release PDCCH is detected in subframe nk (k∈K y ) of serving cell y, V DL DAI, y is 0.


2.2B: Simplified Power Allocation Method.

When the UE is scheduled for both serving cells, it is optimal to determine n HARQ in consideration of the values that the number of consecutive ACKs may have. However, this method has a disadvantage of high complexity. Therefore, so as not to change the value of n HARQ in accordance with the change of the value of My, it is possible to determine the existing M = n same HARQ in the case of 4, or 3;


When M = max (Mx, Mx) ≥ 3 as in I and II described above, an optimal power allocation method may be applied by integrating. That is, in aggregation between cells having different TDD settings, different combinations of M values may occur for each cell. Therefore, there is a need to apply a more optimal method than carrier aggregation having the same UL-DL configuration, and the following method may be used.

ALT X1: Based on DAI.

[Equation 19]

Figure PCTKR2013006507-appb-I000031

ALT X2:

[Equation 20]

Figure PCTKR2013006507-appb-I000032

ALT Y: Based only on the number of PDSCHs received.

Formula 21

Figure PCTKR2013006507-appb-I000033

If SPS scheduling is not allowed in the secondary cell, the NSPS, c of the secondary cell is always zero.

The above-described methods may always be applied when the UL-DL configuration of the cell is different, or may be applied only when Mx and My are different.


III. When (Mx, My) = (2, 1).

According to M = max (Mx, My), the same M = 2 channel selection method is used between the two cells. That is, one ACK / NACK for each subframe is mapped (spatial bundling is applied when two transport blocks can be received in one subframe to generate one ACK / NACK), so that the ACK / NACK for a total of three subframes is mapped. Generate a NACK.

Accordingly, in the channel selection scheme using four PUCCH resources, the ACK / NACK bits (HARQ-ACK (3)) for the second subframe of cell y may be always mapped to NACK.

Alternatively, in the channel selection scheme using three PUCCH resources, HARQ-ACK (0) is ACK / NACK of the first subframe of cell x, and HARQ-ACK (1) is ACK / NACK of the second subframe of cell x, HARQ-ACK. (2) may correspond to ACK / NACK for the first subframe of cell y.


3.1.A: Optimal Power Allocation Method.

When the UE is scheduled for both cells, the number of ACK / NACK combinations is determined according to the number of subframes actually scheduled in cell x. When two subframes are scheduled, four combinations of (A, A), (A, N), (N, A), and (N, N) are possible, and if only one subframe is scheduled, If the subframe is the previous subframe, the result is (A, N), (N, N). The total number of combinations is 4 (when two subframes are scheduled) or 2 (when only one subframe is set).

Since the maximum number of subframes actually scheduled in cell y is 1, only two combinations of ACK and NACK are possible. Thus, the total number of combinations that can be assumed is 8 and optimal n HARQ = 3 (two in cell x, y in turn, if one subframe is scheduled), or n HARQ = 2 (one in cell x) Subframes, when one subframe is scheduled in cell y).

If only one cell is scheduled by the UE, n HARQ = 2 or n HARQ = 1 depending on the combination number of ACK / NACK for cell x.

The number of scheduled subframes also includes inferring through the DL DAI.

When the above-described process is expressed by a formula, it can be expressed as follows. This is the case where DAI can be received when scheduling cell y, or when the DAI value is assumed to be 1.

Formula 22

Figure PCTKR2013006507-appb-I000034

Wherein, V DL DAI, c represents a V DL DAI of the serving cell c. U DAI, c is the U DAI serving cell c. n ACK c is the number of ACK / NACK bits corresponding to the DL transmission mode configured in the serving cell c. When spatial bundling is applied to ACK / NACK, n ACK c = 1. N received k, c is the number of PDCCHs received in subframe nk (k∈K c ) of serving cell c or the number of PDSCHs without corresponding PDCCHs. M c is the number of elements of K c . If the ACK / NACK bundling in a space not applied, it received N k, c is the number of the serving cell c in the sub-frame nk (k∈K c) the number of PDCCH or SPS release of the transport block received on. M c is the number of elements of K c . If no transport block or SPS release PDCCH is detected in subframe nk (k∈K c ) of serving cell c, V DL DAI, c = 0.

When not using the DAI of the cell y can be expressed as follows.

Formula 23

Figure PCTKR2013006507-appb-I000035

Wherein, V DL DAI, x represents the V DL DAI of the serving cell x. U DAI, x is U DAI of the serving cell x. n ACK x is the number of ACK / NACK bits corresponding to the DL transmission mode configured for the serving cell x. When spatial bundling is applied to ACK / NACK, n ACK x = 1. And, N received k, c (x is y or y) is the number of PDCCHs received in subframe nk (k∈K c ) of serving cell c or the number of PDSCHs without corresponding PDCCHs. M c is the number of elements of K c . If the ACK / NACK bundling in a space not applied, it received N k, c is the number of the serving cell c in the sub-frame nk (k∈K c) the number of PDCCH or SPS release of the transport block received on. M c is the number of elements of K c . If no transport block or SPS release PDCCH is detected in subframe nk (k∈K x ) of serving cell x, V DL DAI, x = 0.


3.1.B: Simplified Power Allocation Method.

In order not to change the n HARQ value according to the change of the values of Mx and My, n HARQ may be determined as in the case of the existing M = 4 or 3.


You can use the optimal method for Mx and My. That is, in the case of ACK / NACK corresponding to cell x, as in the case of M = 2, one ACK / NACK for each subframe (when two transport blocks can be received in one subframe, one spatial acknowledgment is applied by applying spatial bundling). / NACK generation), and two ACK / NACK (in case of two transport blocks) and one ACK / NACK (depending on the number of transport blocks, as in the case of M = 1 in the case of ACK / NACK corresponding to cell y). To one transport block).


3.2.A: Optimal Power Allocation Method.

When the UE is scheduled for both cells, the number of ACK / NACK combinations is determined according to the number of subframes actually scheduled in cell x. If both subframes are scheduled, four combinations such as (A, A), (A, N), (N, A), (N, N) are possible, and one of the two subframes If only a subframe is scheduled, the subframe is (A, N), (N, N) if it is a previous subframe, and (N, A), (N, N) if it is a later subframe. The total number of combinations is 4 (when two subframes are scheduled) or 2 (when only one subframe is set). When receiving one transport block or an ACK / NACK response for a control channel, two combinations are used, ACK or NACK. Therefore, the total number of combinations that can be assumed is 8 (when cell y can receive 2 transport blocks), or 6 (when cell y can receive 1 transport block), so that in turn optimal n HARQ = 4 or 3 Becomes

If the UE is scheduled only one cell, n HARQ = 2 or n HARQ = 1 according to the number of combinations of ACK / NACK for cell x, and n HARQ = 2 according to the number of ACK / NACK combinations for cell y. Or n HARQ = 1.

The number of scheduled subframes also includes inferring through the DL DAI.

The above process is the same as that of ALT 3.1A. The definition of N received k, c varies depending on whether one transport block or two transport blocks can be received and is reflected in the n HARQ value.


3.2.B: Simplified Power Allocation Method.

In order not to change the n HARQ value according to the change of the values of Mx and My, n HARQ may be determined as in the case of the existing M = 4 or 3.

Cell x reflects n HARQ = 1 or 2 according to the number of scheduled subframes, and always n HARQ = 2 when cell y is scheduled to not change n HARQ according to the change of transmission mode of cell y. can do.

In order to not change n HARQ according to the number of scheduled subframes, cell x is always n HARQ = 2 when cell y is scheduled, and n HARQ = 2 (according to a change in the number of transport blocks of cell y. 2 transport blocks can be received) or 1 (if 1 transport block can be received).


IV. If (Mx, My) = (4,0) or (3, 0).

In this case, the same method as in the case of (Mx, My) = (4, 1) or (3, 1) can be applied. However, the ACK / NACK combination that may be generated by cell y becomes 0, and may be treated in the same manner as when cell y is not scheduled. Set the value associated with cell y to zero.


V. (Mx, My) = (2, 0).

In this case, the same method as in the case of (Mx, My) = (2, 1) can be applied. However, the ACK / NACK combination that may be generated by cell y becomes 0, and may be treated in the same manner as when cell y is not scheduled. Set the value associated with cell y to zero.


Meanwhile, IV. If either Mx or My becomes 0 as in V., the channel selection method set when setting a single antenna for cell x is applied, and the number of PUCCH format 1b resources selectively used can use Mx private table. have. The optimal power allocation method for each combination of (Mx, My) is as follows.


A. When (Mx, My) = (4,0), (3,0), or (2, 0).

A.1: Set n HARQ = Mx. Since cell y is not scheduled, cell y is irrelevant to possible ACK / NACK combinations. Therefore, no consideration is given to power allocation.

Since ACK / NACK is always spatially bundled in channel selection when configuring a single cell, the maximum number of ACK / NACK combinations that can occur in Mx subframe intervals is 2 Mx . In other words, it is not the optimal combination based on actual scheduling, but the maximum power according to Mx. By setting the power according to the change of Mx, it is possible to avoid setting the power in accordance with the maximum value of Mx that may occur in a specific UL subframe of the terminal.


A.2: Optimal Power Allocation Method.

A.2.1: Optimal Power Allocation Method

The terminal may be 0, 1, m, ..., Mx according to the number of subframes actually scheduled in the cell x. Thus, the total ACK / NACK combination that can be assumed is 2 m . In this case, optimal n HARQ = m.

When determining the number of scheduled subframes, it can also be inferred through the DL DAI.

The equation based on the number of subframes that can be inferred through the DL DAI is as follows.

Formula 24

Figure PCTKR2013006507-appb-I000036

Wherein, V DL DAI, c represents a V DL DAI of the serving cell c. U DAI, c is the U DAI serving cell c. n ACK c is the number of ACK / NACK bits corresponding to the DL transmission mode configured in the serving cell c. When spatial bundling is applied to ACK / NACK, n ACK c = 1. N received k, c is the number of PDCCHs received in subframe nk (k∈K c ) of serving cell c or the number of PDSCHs without corresponding PDCCHs. M c is the number of elements of K c . If the ACK / NACK bundling in a space not applied, it received N k, c is the number of the serving cell c in the sub-frame nk (k∈K c) the number of PDCCH or SPS release of the transport block received on. M c is the number of elements of K c . If no transport block or SPS release PDCCH is detected in subframe nk (k∈K c ) of serving cell c, V DL DAI, c = 0.

Meanwhile, n HARQ may be represented as follows.

[Equation 25]

Figure PCTKR2013006507-appb-I000037

In the above formula, if SPS is not allowed in the secondary cell, N SPS, c of the secondary cell is always zero.

Without considering the DAI, n HARQ may be represented as follows.

Formula 26

Figure PCTKR2013006507-appb-I000038

On the other hand, if only cell x is considered, n HARQ may be represented as follows.

[Equation 27]

Figure PCTKR2013006507-appb-I000039

Wherein, V DL DAI, x represents the V DL DAI of the serving cell x. U DAI, x is U DAI of the serving cell x. n ACK x is the number of ACK / NACK bits corresponding to the DL transmission mode configured for the serving cell x. When spatial bundling is applied to ACK / NACK, n ACK x = 1. And, received N k, x is the number of PDSCH without PDCCH is a PDCCH corresponding to the number or received in subframe nk (k∈K x) of the serving cell x. M x is the number of elements of K x . If spatial bundling is not applied to ACK / NACK, N received k, x is the number of transport blocks or SPS release PDCCHs received in subframe nk (k∈K x ) of serving cell x. M x is the number of elements of K x . If no transport block or SPS release PDCCH is detected in subframe nk (k∈K x ) of serving cell x, V DL DAI, x = 0.

Considering only the cell x, n HARQ may be represented as follows.

[Equation 28]

Figure PCTKR2013006507-appb-I000040

In the above formula, if SPS is not allowed in the secondary cell, N SPS, c of the secondary cell is always zero.

If only cell x is considered without considering DAI, n HARQ may be represented as follows.

Formula 29

Figure PCTKR2013006507-appb-I000041

B. When (Mx, My) = (1, 0).

In this case, since PUCCH format 1b is used, n HARQ is set to the number of ACK / NACK bits transmitted in the corresponding subframe.


The methods described in A and B may also be applied when channel selection is applied when the UE receives a single cell configuration. It can be applied only when a spatial orthogonal resource transmit diversity (SORTD) is applied to channel selection. That is, in the case of channel selection for a single cell of TDD, n HARQ is determined based on the number of transmission bits when transmitting a single antenna port, and n based on the number of PDSCHs actually received by the terminal when transmitting two antenna ports. HARQ can be determined.

It can be applied only to a terminal capable of supporting aggregation of TDD cells having different UL-DL configurations. The UE may be always applied or used in a single cell configuration or may be instructed through an RRC message.

The following table shows transmission of a single antenna port (SAP) and transmission of two antenna ports using SORTD in a PUCCH format 1b using M = 4, channel selection when using a 2 Rx antenna, using a 2 Rx antenna on a channel having an ETU of 3 km. Is the required SNR.

TABLE 13

Figure PCTKR2013006507-appb-I000042

In the case of the existing SAP, n HARQ is set based on the M value, so n HARQ = 4 and the transmission power is always set according to -6.2dB. The UE consumes unnecessary power when the number of scheduled PDSCHs is 4 or less, for example, 2, which is -7.5 dB, which causes interference to the UE using the same frequency resource, thereby reducing overall system performance. cause.

In particular, even when SORTD is used, the transmission power is set according to -7.2dB when n HARQ is based on M. Since the scheduling of two PDSCHs is large, the SAP transmission power can be set to -7.5dB. There is no reason to waste transmission power using SORTD, which uses resources.

Therefore, even when using at least SORTD, it is preferable to set the n HARQ value to match the number of PDSCHs actually received. In the case of SAP transmission when selecting the TDD single cell channel of the existing LTE Rel 8 to 10 n HARQ was set based on M. Therefore, in order to configure n HARQ only in LTE Rel-11, version-dependent additional signaling is required, whereas SORTD transmission is applied from LTE Rel-11 when selecting TDD single cell channel, so the PDSCH reference that actually received n HARQ for this is applied. Setting does not require additional signaling.

On the other hand, the simplified power allocation method always applies to aggregation of cells having different UL-DL configurations, or always applies when (Mx, My) = (1: 1), or not Mx = My. In case it is always applicable.


17 shows a configuration of a base station and a terminal according to an embodiment of the present invention.

The base station 100 includes a processor 110, a memory 120, and an RF unit 130. The processor 110 implements the proposed functions, processes and / or methods. The memory 120 is connected to the processor 110 and stores various information for driving the processor 110. The RF unit 130 is connected to the processor 110 and transmits and / or receives a radio signal.

The terminal 200 includes a processor 210, a memory 220, and an RF unit 230. The processor 210 implements the proposed functions, processes and / or methods. The memory 220 is connected to the processor 210 and stores various information for driving the processor 210. The RF unit 230 is connected to the processor 210 to transmit and / or receive a radio signal.

Processors 110 and 210 may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, data processing devices, and / or converters for interconverting baseband signals and wireless signals. The memory 120, 220 may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium, and / or other storage device. The RF unit 130 and 230 may include one or more antennas for transmitting and / or receiving a radio signal. When the embodiment is implemented in software, the above-described technique may be implemented as a module (process, function, etc.) for performing the above-described function. The module may be stored in the memories 120 and 220 and executed by the processors 110 and 210. The memories 120 and 220 may be inside or outside the processors 110 and 210, and may be connected to the processors 110 and 210 by various well-known means.

Claims (11)

  1. In the transmission power determination method of the uplink control channel of the terminal having two cells having different UL-DL configuration set from the base station,
    The number N1 of downlink subframes corresponding to subframe n of the first cell having the first UL-DL configuration and the number of downlink subframes corresponding to the subframe n of the second cell having the second UL-DL configuration. Select a larger value of count N2, and
    Determine a value of a parameter based on the selected value,
    The parameter is a parameter that determines the transmission power of the uplink control channel transmitted in the subframe n. However, n, N1, N2 are integers of 0 or more.
  2. 2. The method of claim 1 wherein the selected value is 3 or 4.
  3. The method of claim 2, wherein the value of the parameter is 2 when a control channel indicating release of a data channel or semi-static scheduling is received in a subframe nk of only one of the first cell and the second cell. , Otherwise, 4.
  4. 4. The method of claim 3, wherein k is determined for each UL-DL configuration and subframe n as shown in the following table.
    Figure PCTKR2013006507-appb-I000043
  5. The method of claim 1, wherein the first cell is a primary cell in which the terminal performs an initial connection establishment procedure or a connection reestablishment procedure with the base station.
  6. 6. The method of claim 5, wherein the second cell is a secondary cell added to the primary cell.
  7. The method of claim 1, wherein the value of the parameter is
    A parameter for determining transmit power of an uplink control channel transmitted in the subframe n when the first cell and the second cell have the same UL-DL configuration corresponding to a larger value of the N1 and the N2. Characterized in that the same as the value.
  8. The method of claim 1, wherein the first UL-DL configuration and the second UL-DL configuration are two different two of the UL-DL configurations of the following table.
    Figure PCTKR2013006507-appb-I000044

    In the above table, D denotes a downlink subframe, S denotes a special subframe, and U denotes an uplink subframe.
  9. The method of claim 1, wherein one of said N1, N2 values is 3 or 4, and the other is 0, 1, or 2.
  10. The method of claim 1, wherein the first cell and the second cell are time division duplex (TDD) cells.
  11. The apparatus for determining the transmit power of the uplink control channel
    RF unit for transmitting and receiving a wireless signal; And
    Including a processor connected to the RF unit,
    The processor may determine the number N1 of downlink subframes corresponding to the subframe n of the first cell having the first UL-DL configuration and the downlink corresponding to the subframe n of the second cell having the second UL-DL configuration. Select a larger value of the number N2 of subframes, and
    Determine a value of a parameter based on the selected value,
    The parameter is a parameter that determines the transmission power of the uplink control channel transmitted in the subframe n.
PCT/KR2013/006507 2012-07-19 2013-07-19 Method and apparatus for determining transmission power of uplink control channel in wireless communication system WO2014014319A1 (en)

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